chore(i18n,learn): processed translations (#44851)

curriculum/challenges/japanese/10-coding-interview-prep/rosetta-code/equilibrium-index.md

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+---
+id: 5987fd532b954e0f21b5d3f6
+title: Equilibrium index
+challengeType: 5
+forumTopicId: 302255
+dashedName: equilibrium-index
+---
+
+# --description--
+
+An equilibrium index of a sequence is an index into the sequence such that the sum of elements at lower indices is equal to the sum of elements at higher indices.
+
+For example, in a sequence $A$:
+
+<ul style='list-style: none;'>
+  <li><big>$A_0 = -7$</big></li>
+  <li><big>$A_1 =  1$</big></li>
+  <li><big>$A_2 =  5$</big></li>
+  <li><big>$A_3 =  2$</big></li>
+  <li><big>$A_4 = -4$</big></li>
+  <li><big>$A_5 =  3$</big></li>
+  <li><big>$A_6 =  0$</big></li>
+</ul>
+
+`3` is an equilibrium index, because:
+
+<ul style='list-style: none;'>
+  <li><big>$A_0 + A_1 + A_2 = A_4 + A_5 + A_6$</big></li>
+</ul>
+
+`6` is also an equilibrium index, because:
+
+<ul style='list-style: none;'>
+  <li><big>$A_0 + A_1 + A_2 + A_3 + A_4 + A_5 = 0$</big></li>
+</ul>
+
+(sum of zero elements is zero)
+
+`7` is not an equilibrium index, because it is not a valid index of sequence $A$.
+
+# --instructions--
+
+Write a function that, given a sequence, returns its equilibrium indices (if any).
+
+Assume that the sequence may be very long.
+
+# --hints--
+
+`equilibrium` should be a function.
+
+```js
+assert(typeof equilibrium === 'function');
+```
+
+`equilibrium([-7, 1, 5, 2, -4, 3, 0])` should return `[3,6]`.
+
+```js
+assert.deepEqual(equilibrium(equilibriumTests[0]), ans[0]);
+```
+
+`equilibrium([2, 4, 6])` should return `[]`.
+
+```js
+assert.deepEqual(equilibrium(equilibriumTests[1]), ans[1]);
+```
+
+`equilibrium([2, 9, 2])` should return `[1]`.
+
+```js
+assert.deepEqual(equilibrium(equilibriumTests[2]), ans[2]);
+```
+
+`equilibrium([1, -1, 1, -1, 1, -1, 1])` should return `[0,1,2,3,4,5,6]`.
+
+```js
+assert.deepEqual(equilibrium(equilibriumTests[3]), ans[3]);
+```
+
+`equilibrium([1])` should return `[0]`.
+
+```js
+assert.deepEqual(equilibrium(equilibriumTests[4]), ans[4]);
+```
+
+`equilibrium([])` should return `[]`.
+
+```js
+assert.deepEqual(equilibrium(equilibriumTests[5]), ans[5]);
+```
+
+# --seed--
+
+## --after-user-code--
+
+```js
+const equilibriumTests =
+  [[-7, 1, 5, 2, -4, 3, 0], // 3, 6
+  [2, 4, 6], // empty
+  [2, 9, 2], // 1
+  [1, -1, 1, -1, 1, -1, 1], // 0,1,2,3,4,5,6
+  [1], // 0
+  [] // empty
+  ];
+const ans = [[3, 6], [], [1], [0, 1, 2, 3, 4, 5, 6], [0], []];
+```
+
+## --seed-contents--
+
+```js
+function equilibrium(a) {
+
+}
+```
+
+# --solutions--
+
+```js
+function equilibrium(a) {
+  let N = a.length,
+    i,
+    l = [],
+    r = [],
+    e = [];
+  for (l[0] = a[0], r[N - 1] = a[N - 1], i = 1; i < N; i++)
+    { l[i] = l[i - 1] + a[i], r[N - i - 1] = r[N - i] + a[N - i - 1]; }
+  for (i = 0; i < N; i++)
+    { if (l[i] === r[i]) e.push(i); }
+  return e;
+}
+```