ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
287 lines
12 KiB
Markdown
287 lines
12 KiB
Markdown
---
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id: 5900f37a1000cf542c50fe8c
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title: 'Problem 13: Large sum'
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challengeType: 5
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forumTopicId: 301757
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dashedName: problem-13-large-sum
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---
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# --description--
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Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.
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<div style='padding-left: 4em;'>
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37107287533902102798797998220837590246510135740250<br>
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46376937677490009712648124896970078050417018260538<br>
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74324986199524741059474233309513058123726617309629<br>
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91942213363574161572522430563301811072406154908250<br>
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23067588207539346171171980310421047513778063246676<br>
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89261670696623633820136378418383684178734361726757<br>
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28112879812849979408065481931592621691275889832738<br>
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44274228917432520321923589422876796487670272189318<br>
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47451445736001306439091167216856844588711603153276<br>
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70386486105843025439939619828917593665686757934951<br>
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62176457141856560629502157223196586755079324193331<br>
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64906352462741904929101432445813822663347944758178<br>
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92575867718337217661963751590579239728245598838407<br>
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58203565325359399008402633568948830189458628227828<br>
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80181199384826282014278194139940567587151170094390<br>
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35398664372827112653829987240784473053190104293586<br>
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86515506006295864861532075273371959191420517255829<br>
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71693888707715466499115593487603532921714970056938<br>
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54370070576826684624621495650076471787294438377604<br>
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53282654108756828443191190634694037855217779295145<br>
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36123272525000296071075082563815656710885258350721<br>
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45876576172410976447339110607218265236877223636045<br>
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17423706905851860660448207621209813287860733969412<br>
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81142660418086830619328460811191061556940512689692<br>
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51934325451728388641918047049293215058642563049483<br>
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62467221648435076201727918039944693004732956340691<br>
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15732444386908125794514089057706229429197107928209<br>
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55037687525678773091862540744969844508330393682126<br>
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18336384825330154686196124348767681297534375946515<br>
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80386287592878490201521685554828717201219257766954<br>
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78182833757993103614740356856449095527097864797581<br>
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16726320100436897842553539920931837441497806860984<br>
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48403098129077791799088218795327364475675590848030<br>
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87086987551392711854517078544161852424320693150332<br>
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59959406895756536782107074926966537676326235447210<br>
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69793950679652694742597709739166693763042633987085<br>
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41052684708299085211399427365734116182760315001271<br>
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65378607361501080857009149939512557028198746004375<br>
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35829035317434717326932123578154982629742552737307<br>
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94953759765105305946966067683156574377167401875275<br>
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88902802571733229619176668713819931811048770190271<br>
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25267680276078003013678680992525463401061632866526<br>
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36270218540497705585629946580636237993140746255962<br>
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24074486908231174977792365466257246923322810917141<br>
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91430288197103288597806669760892938638285025333403<br>
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34413065578016127815921815005561868836468420090470<br>
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23053081172816430487623791969842487255036638784583<br>
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11487696932154902810424020138335124462181441773470<br>
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63783299490636259666498587618221225225512486764533<br>
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67720186971698544312419572409913959008952310058822<br>
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95548255300263520781532296796249481641953868218774<br>
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76085327132285723110424803456124867697064507995236<br>
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37774242535411291684276865538926205024910326572967<br>
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23701913275725675285653248258265463092207058596522<br>
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29798860272258331913126375147341994889534765745501<br>
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18495701454879288984856827726077713721403798879715<br>
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38298203783031473527721580348144513491373226651381<br>
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34829543829199918180278916522431027392251122869539<br>
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40957953066405232632538044100059654939159879593635<br>
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29746152185502371307642255121183693803580388584903<br>
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41698116222072977186158236678424689157993532961922<br>
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62467957194401269043877107275048102390895523597457<br>
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23189706772547915061505504953922979530901129967519<br>
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86188088225875314529584099251203829009407770775672<br>
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11306739708304724483816533873502340845647058077308<br>
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82959174767140363198008187129011875491310547126581<br>
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97623331044818386269515456334926366572897563400500<br>
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42846280183517070527831839425882145521227251250327<br>
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55121603546981200581762165212827652751691296897789<br>
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32238195734329339946437501907836945765883352399886<br>
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75506164965184775180738168837861091527357929701337<br>
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62177842752192623401942399639168044983993173312731<br>
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32924185707147349566916674687634660915035914677504<br>
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99518671430235219628894890102423325116913619626622<br>
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73267460800591547471830798392868535206946944540724<br>
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76841822524674417161514036427982273348055556214818<br>
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97142617910342598647204516893989422179826088076852<br>
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87783646182799346313767754307809363333018982642090<br>
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10848802521674670883215120185883543223812876952786<br>
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71329612474782464538636993009049310363619763878039<br>
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62184073572399794223406235393808339651327408011116<br>
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66627891981488087797941876876144230030984490851411<br>
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60661826293682836764744779239180335110989069790714<br>
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85786944089552990653640447425576083659976645795096<br>
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66024396409905389607120198219976047599490197230297<br>
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64913982680032973156037120041377903785566085089252<br>
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16730939319872750275468906903707539413042652315011<br>
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94809377245048795150954100921645863754710598436791<br>
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78639167021187492431995700641917969777599028300699<br>
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15368713711936614952811305876380278410754449733078<br>
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40789923115535562561142322423255033685442488917353<br>
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44889911501440648020369068063960672322193204149535<br>
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41503128880339536053299340368006977710650566631954<br>
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81234880673210146739058568557934581403627822703280<br>
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82616570773948327592232845941706525094512325230608<br>
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22918802058777319719839450180888072429661980811197<br>
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77158542502016545090413245809786882778948721859617<br>
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72107838435069186155435662884062257473692284509516<br>
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20849603980134001723930671666823555245252804609722<br>
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53503534226472524250874054075591789781264330331690<br>
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</div>
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# --hints--
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`largeSum(testNums)` should return a number.
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```js
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assert(typeof largeSum(testNums) === 'number');
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```
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`largeSum(testNums)` should return 8348422521.
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```js
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assert.strictEqual(largeSum(testNums), 8348422521);
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```
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`largeSum(fiftyDigitNums)` should return 5537376230.
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```js
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assert.strictEqual(largeSum(fiftyDigitNums), 5537376230);
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```
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# --seed--
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## --before-user-code--
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```js
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const fiftyDigitNums = [
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'37107287533902102798797998220837590246510135740250',
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'46376937677490009712648124896970078050417018260538',
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'74324986199524741059474233309513058123726617309629',
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'91942213363574161572522430563301811072406154908250',
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'23067588207539346171171980310421047513778063246676',
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'89261670696623633820136378418383684178734361726757',
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'28112879812849979408065481931592621691275889832738',
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'44274228917432520321923589422876796487670272189318',
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'47451445736001306439091167216856844588711603153276',
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'70386486105843025439939619828917593665686757934951',
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'62176457141856560629502157223196586755079324193331',
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'64906352462741904929101432445813822663347944758178',
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'92575867718337217661963751590579239728245598838407',
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'58203565325359399008402633568948830189458628227828',
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'80181199384826282014278194139940567587151170094390',
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'35398664372827112653829987240784473053190104293586',
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'86515506006295864861532075273371959191420517255829',
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'71693888707715466499115593487603532921714970056938',
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'54370070576826684624621495650076471787294438377604',
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'53282654108756828443191190634694037855217779295145',
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'36123272525000296071075082563815656710885258350721',
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'45876576172410976447339110607218265236877223636045',
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'17423706905851860660448207621209813287860733969412',
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'81142660418086830619328460811191061556940512689692',
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'51934325451728388641918047049293215058642563049483',
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'62467221648435076201727918039944693004732956340691',
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'15732444386908125794514089057706229429197107928209',
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'55037687525678773091862540744969844508330393682126',
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'18336384825330154686196124348767681297534375946515',
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'80386287592878490201521685554828717201219257766954',
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'78182833757993103614740356856449095527097864797581',
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'16726320100436897842553539920931837441497806860984',
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'48403098129077791799088218795327364475675590848030',
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'87086987551392711854517078544161852424320693150332',
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'59959406895756536782107074926966537676326235447210',
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'69793950679652694742597709739166693763042633987085',
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'41052684708299085211399427365734116182760315001271',
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'65378607361501080857009149939512557028198746004375',
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'35829035317434717326932123578154982629742552737307',
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'94953759765105305946966067683156574377167401875275',
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'88902802571733229619176668713819931811048770190271',
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'25267680276078003013678680992525463401061632866526',
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'36270218540497705585629946580636237993140746255962',
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'24074486908231174977792365466257246923322810917141',
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'91430288197103288597806669760892938638285025333403',
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'34413065578016127815921815005561868836468420090470',
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'23053081172816430487623791969842487255036638784583',
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'11487696932154902810424020138335124462181441773470',
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'63783299490636259666498587618221225225512486764533',
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'67720186971698544312419572409913959008952310058822',
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'95548255300263520781532296796249481641953868218774',
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'76085327132285723110424803456124867697064507995236',
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'37774242535411291684276865538926205024910326572967',
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'23701913275725675285653248258265463092207058596522',
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'29798860272258331913126375147341994889534765745501',
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'18495701454879288984856827726077713721403798879715',
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'38298203783031473527721580348144513491373226651381',
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'34829543829199918180278916522431027392251122869539',
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'40957953066405232632538044100059654939159879593635',
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'29746152185502371307642255121183693803580388584903',
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'41698116222072977186158236678424689157993532961922',
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'62467957194401269043877107275048102390895523597457',
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'23189706772547915061505504953922979530901129967519',
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'86188088225875314529584099251203829009407770775672',
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'11306739708304724483816533873502340845647058077308',
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'82959174767140363198008187129011875491310547126581',
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'97623331044818386269515456334926366572897563400500',
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'42846280183517070527831839425882145521227251250327',
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'55121603546981200581762165212827652751691296897789',
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'32238195734329339946437501907836945765883352399886',
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'75506164965184775180738168837861091527357929701337',
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'62177842752192623401942399639168044983993173312731',
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'32924185707147349566916674687634660915035914677504',
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'99518671430235219628894890102423325116913619626622',
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'73267460800591547471830798392868535206946944540724',
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'76841822524674417161514036427982273348055556214818',
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'97142617910342598647204516893989422179826088076852',
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'87783646182799346313767754307809363333018982642090',
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'10848802521674670883215120185883543223812876952786',
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'71329612474782464538636993009049310363619763878039',
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'62184073572399794223406235393808339651327408011116',
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'66627891981488087797941876876144230030984490851411',
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'60661826293682836764744779239180335110989069790714',
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'85786944089552990653640447425576083659976645795096',
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'66024396409905389607120198219976047599490197230297',
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'64913982680032973156037120041377903785566085089252',
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'16730939319872750275468906903707539413042652315011',
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'94809377245048795150954100921645863754710598436791',
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'78639167021187492431995700641917969777599028300699',
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'15368713711936614952811305876380278410754449733078',
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'40789923115535562561142322423255033685442488917353',
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'44889911501440648020369068063960672322193204149535',
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'41503128880339536053299340368006977710650566631954',
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'81234880673210146739058568557934581403627822703280',
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'82616570773948327592232845941706525094512325230608',
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'22918802058777319719839450180888072429661980811197',
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'77158542502016545090413245809786882778948721859617',
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'72107838435069186155435662884062257473692284509516',
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'20849603980134001723930671666823555245252804609722',
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'53503534226472524250874054075591789781264330331690'
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];
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const testNums = [
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'37107287533902102798797998220837590246510135740250',
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'46376937677490009712648124896970078050417018260538'
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];
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```
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## --seed-contents--
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```js
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function largeSum(arr) {
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return true;
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}
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// Only change code above this line
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const testNums = [
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'37107287533902102798797998220837590246510135740250',
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'46376937677490009712648124896970078050417018260538'
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];
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largeSum(testNums);
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```
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# --solutions--
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```js
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function largeSum(arr) {
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let sum = 0;
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arr.forEach(function(num) {
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sum += parseInt(num, 10);
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});
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sum = sum.toString(10);
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sum = sum.substr(0, 1) + sum.substr(2);
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let firstTen = sum.slice(0, 10);
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return parseInt(firstTen, 10);
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}
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```
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