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/*
(无序区,有序区)。从无序区通过交换找出最大元素放到有序区前端。
选择排序思路:
1. 比较相邻的元素。如果第一个比第二个大,就交换他们两个。
2. 对每一对相邻元素作同样的工作,从开始第一对到结尾的最后一对。这步做完后,最后的元素会是最大的数。
3. 针对所有的元素重复以上的步骤,除了最后一个。
4. 持续每次对越来越少的元素重复上面的步骤,直到没有任何一对数字需要比较。
*/
// 冒泡排序
void BubbleSort(vector<int>& v) {
int len = v.size();
for (int i = 0; i < len - 1; ++i)
for (int j = 0; j < len - 1 - i; ++j)
if (v[j] > v[j + 1])
swap(v[j], v[j + 1]);
}
// 模板实现冒泡排序
template<typename T> //整數或浮點數皆可使用,若要使用物件(class)時必須設定大於(>)的運算子功能
void bubble_sort(T arr[], int len) {
for (int i = 0; i < len - 1; i++)
for (int j = 0; j < len - 1 - i; j++)
if (arr[j] > arr[j + 1])
swap(arr[j], arr[j + 1]);
}
// 冒泡排序(改进版)
void BubbleSort_orderly(vector<int>& v) {
int len = v.size();
bool orderly = false;
for (int i = 0; i < len - 1 && !orderly; ++i) {
orderly = true;
for (int j = 0; j < len - 1 - i; ++j) {
if (v[j] > v[j + 1]) { // 从小到大
orderly = false; // 发生交换则仍非有序
swap(v[j], v[j + 1]);
}
}
}
}
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