poj 1833 组合数学——排列

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  1. problem link:http://poj.org/problem?id=1833
  2. 解题思路:题意就不讲了是个中文题。此题用排列函数next_permutation()很容易就解决了。还有就是我在用普通输出的时候超时了,就用了下面那种输出方式才过。请看代码:
  3. 3.
#include<cstdio>
#include<iostream> 
#include<algorithm>
#include <iterator>
using namespace std;
const int N=1024;
int a[N];
int main(){
    ios::sync_with_stdio(false);cin.tie(0);
    int T;scanf("%d",&T);
    while(T--){
        int n,k;scanf("%d%d",&n,&k);
        for(int i=0;i<n;i++)scanf("%d",&a[i]);
        while(k--)next_permutation(a,a+n);
        copy(a,a+n-1,ostream_iterator<int>(cout," "));
        cout << a[n-1] << endl;
    }
} 

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转载自blog.csdn.net/Light2Chasers/article/details/82054115