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Update source codes.
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@ -30,7 +30,7 @@ function extend(nums: number[], enlarge: number): number[] {
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/* 在数组的索引 index 处插入元素 num */
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function insert(nums: number[], num: number, index: number): void {
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// 把索引 index 以及之后的所有元素向后移动一位
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for (let i = nums.length - 1; i >= index; i--) {
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for (let i = nums.length - 1; i > index; i--) {
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nums[i] = nums[i - 1];
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}
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// 将 num 赋给 index 处元素
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