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Polish some contents.
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@ -11,12 +11,11 @@ void selectionSort(vector<int> &nums) {
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int n = nums.size();
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// 外循环:未排序区间为 [i, n-1]
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for (int i = 0; i < n - 1; i++) {
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// 内循环:找到未排序区间 [i, n-1] 中的最小元素
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// 内循环:找到未排序区间内的最小元素
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int k = i;
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for (int j = i + 1; j < n; j++) {
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if (nums[j] < nums[k]) {
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k = j; // 更新最小元素
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}
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if (nums[j] < nums[k])
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k = j; // 记录最小元素的索引
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}
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// 将该最小元素与未排序区间的首个元素交换
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swap(nums[i], nums[k]);
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