freeCodeCamp/curriculum/challenges/chinese/10-coding-interview-prep/rosetta-code/greatest-subsequential-sum.md

id, title, challengeType, forumTopicId, dashedName

id	title	challengeType	forumTopicId	dashedName
5a23c84252665b21eecc7e84	Greatest subsequential sum	5	302278	greatest-subsequential-sum

--description--

Given a sequence of integers, find a continuous subsequence which maximizes the sum of its elements, that is, the elements of no other single subsequence add up to a value larger than this one.

An empty subsequence is considered to have the sum of \( 0 \); thus if all elements are negative, the result must be the empty sequence.

--hints--

maximumSubsequence should be a function.

assert(typeof maximumSubsequence == 'function');

maximumSubsequence([ 1, 2, -1, 3, 10, -10 ]) should return an array.

assert(Array.isArray(maximumSubsequence([1, 2, -1, 3, 10, -10])));

maximumSubsequence([ 1, 2, -1, 3, 10, -10 ]) should return [ 1, 2, -1, 3, 10 ].

assert.deepEqual(maximumSubsequence([1, 2, -1, 3, 10, -10]), [1, 2, -1, 3, 10]);

maximumSubsequence([ 0, 8, 10, -2, -4, -1, -5, -3 ]) should return [ 0, 8, 10 ].

assert.deepEqual(maximumSubsequence([0, 8, 10, -2, -4, -1, -5, -3]), [
  0,
  8,
  10
]);

maximumSubsequence([ 9, 9, -10, 1 ]) should return [ 9, 9 ].

assert.deepEqual(maximumSubsequence([9, 9, -10, 1]), [9, 9]);

maximumSubsequence([ 7, 1, -5, -3, -8, 1 ]) should return [ 7, 1 ].

assert.deepEqual(maximumSubsequence([7, 1, -5, -3, -8, 1]), [7, 1]);

maximumSubsequence([ -3, 6, -1, 4, -4, -6 ]) should return [ 6, -1, 4 ].

assert.deepEqual(maximumSubsequence([-3, 6, -1, 4, -4, -6]), [6, -1, 4]);

maximumSubsequence([ -1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1 ]) should return [ 3, 5, 6, -2, -1, 4 ].

assert.deepEqual(maximumSubsequence([-1, -2, 3, 5, 6, -2, -1, 4, -4, 2, -1]), [
  3,
  5,
  6,
  -2,
  -1,
  4
]);

--seed--

--seed-contents--

function maximumSubsequence(population) {

}

--solutions--

function maximumSubsequence(population) {
  function sumValues(arr) {
      var result = 0;
      for (var i = 0, len = arr.length; i < len; i++) {
          result += arr[i];
      }
      return result;
  }
  var greatest;
  var maxValue = 0;

  for (var i = 0, len = population.length; i < len; i++) {
      for (var j = i; j <= len; j++) {
          var subsequence = population.slice(i, j);
          var value = sumValues(subsequence);
          if (value > maxValue) {
              maxValue = value;
              greatest = subsequence;
          };
      }
  }

  return greatest;
}