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

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+---
+title: Equilibrium index
+id: 5987fd532b954e0f21b5d3f6
+challengeType: 5
+videoUrl: ''
+localeTitle: 均衡指数
+---
+
+## Description
+<section id="description"><p>序列的平衡指数是序列的索引，使得较低指数处的元素之和等于较高指数处的元素之和。 </p><p>例如，在序列<big>$ A $中</big> ： </p><p> :::: <big>$ A_0 = -7 $</big> </p><p> :::: <big>$ A_1 = 1 $</big> </p><p> :::: <big>$ A_2 = 5 $</big> </p><p> :::: <big>$ A_3 = 2 $</big> </p><p> :::: <big>$ A_4 = -4 $</big> </p><p> :::: <big>$ A_5 = 3 $</big> </p><p> :::: <big>$ A_6 = 0 $</big> </p><p> 3是均衡指数，因为： </p><p> :::: <big>$ A_0 + A_1 + A_2 = A_4 + A_5 + A_6 $</big> </p><p> 6也是均衡指数，因为： </p><p> :::: <big>$ A_0 + A_1 + A_2 + A_3 + A_4 + A_5 = 0 $</big> </p><p> （零元素之和为零） </p><p> 7不是均衡指数，因为它不是序列<big>$ A $</big>的有效索引。 </p><p>编写一个函数，给定一个序列，返回其平衡指数（如果有的话）。 </p><p>假设序列可能很长。 </p></section>
+
+## Instructions
+<section id="instructions">
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: <code>equilibrium</code>是一种功能。
+    testString: assert(typeof equilibrium === 'function');
+  - text: '<code>equilibrium([-7, 1, 5, 2, -4, 3, 0])</code> <code>[3,6]</code> <code>equilibrium([-7, 1, 5, 2, -4, 3, 0])</code>应该返回<code>[3,6]</code> 。'
+    testString: assert.deepEqual(equilibrium(equilibriumTests[0]), ans[0]);
+  - text: '<code>equilibrium([2, 4, 6])</code>应该返回<code>[]</code> 。'
+    testString: assert.deepEqual(equilibrium(equilibriumTests[1]), ans[1]);
+  - text: '<code>equilibrium([2, 9, 2])</code>应该返回<code>[1]</code> 。'
+    testString: assert.deepEqual(equilibrium(equilibriumTests[2]), ans[2]);
+  - text: '<code>equilibrium([1, -1, 1, -1, 1, -1, 1])</code>应该返回<code>[0,1,2,3,4,5,6]</code> 。'
+    testString: assert.deepEqual(equilibrium(equilibriumTests[3]), ans[3]);
+  - text: '<code>equilibrium([1])</code>应该返回<code>[0]</code> 。'
+    testString: assert.deepEqual(equilibrium(equilibriumTests[4]), ans[4]);
+  - text: '<code>equilibrium([])</code>应该返回<code>[]</code> 。'
+    testString: assert.deepEqual(equilibrium(equilibriumTests[5]), ans[5]);
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='js-seed'>
+
+```js
+function equilibrium (a) {
+  // Good luck!
+}
+
+```
+
+</div>
+
+
+### After Test
+<div id='js-teardown'>
+
+```js
+console.info('after the test');
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```js
+// solution required
+```
+
+/section>