17 lines
243 B
JavaScript
17 lines
243 B
JavaScript
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function equilibrium(arr) {
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let sum = arr.reduce((a, b) => a + b);
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let leftSum = 0;
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for (let i = 0; i < arr.length; ++i) {
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sum -= arr[i];
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if (leftSum === sum) {
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return i;
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}
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leftSum += arr[i];
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}
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return -1;
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}
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