C语言考试练习题_排列 （C++代码）用next_permutation来解题

解题思路:

注意事项:

参考代码:

#include <iostream>
#include <algorithm>
using namespace std;
int main(){
	int a[4];
	for(int i=0;i<4;i++)
		cin>>a[i];
	sort(a,a+4);
	int b[3]={a[0],a[1],a[2]};
	int c[3]={a[0],a[1],a[3]};
	int d[3]={a[0],a[2],a[3]};
	int e[3]={a[1],a[2],a[3]};
	do{
		cout<<b[0]<<" "<<b[1]<<" "<<b[2]<<endl;
	}
	while(next_permutation(b,b+3));
	do{
		cout<<c[0]<<" "<<c[1]<<" "<<c[2]<<endl;
	}
	while(next_permutation(c,c+3));
	do{
		cout<<d[0]<<" "<<d[1]<<" "<<d[2]<<endl;
	}
	while(next_permutation(d,d+3));
	do{
		cout<<e[0]<<" "<<e[1]<<" "<<e[2]<<endl;
	}
	while(next_permutation(e,e+3));
	return 0;
}