排序1,2......n的无序数组,时间复杂度为o(n),空间复杂度为o(1)
#include "stdafx.h" #include <iostream> using namespace std; int _tmain(int argc, _TCHAR* argv[]) { int a[] = { 10, 6, 9, 5, 2, 8, 4, 7, 1, 3 }; int len = sizeof(a) / sizeof(int); int temp; for (int i = 0; i < len;) { temp = a[a[i] - 1]; a[a[i] - 1] = a[i]; a[i] = temp; //当数字的大小等于位置大小的时候,说明该数字移到了正确位置 if (a[i] == i+1) { i++; } } for (int j = 0; j < len; j++) { cout << a[j] << " "; } cout << endl; system("pause"); return 0; }