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Update the comments of bubble sort
and insertion sort
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@ -48,9 +48,9 @@ int quadratic(int n) {
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/* 平方阶(冒泡排序) */
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int bubbleSort(vector<int> &nums) {
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int count = 0; // 计数器
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// 外循环:待排序元素数量为 n-1, n-2, ..., 1
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// 外循环:未排序区间为 [0, i]
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for (int i = nums.size() - 1; i > 0; i--) {
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// 内循环:冒泡操作
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// 内循环:将未排序区间 [0, i] 中的最大元素交换至该区间的最右端
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for (int j = 0; j < i; j++) {
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if (nums[j] > nums[j + 1]) {
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// 交换 nums[j] 与 nums[j + 1]
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