解题思路:
C内部自带全排列函数:
next_permutation(arr,arr+size); 求下一个全排列
prev_permutation(arr,arr+size); 求上一个全排列
The return value which is a bool type.
The global varible g_count set value 1;
注意事项:
参考代码:
#include <iostream> #include <algorithm> using namespace std; int g_count = 1; int main() { int index; cin >> index; int arr[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; do { if (index == g_count) { for (int i = 0; i<10; i++) { cout << arr[i]; } cout << endl; break; } g_count++; } while (next_permutation(arr, arr+10)); return 0; }
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