13元买东西

#include <iostream>
int main(){
	int n=4,m=13,f,t,o,sum=0;
	for(int f=0;f<=m;f++){
		for(int t=0;t<=m;t++){
			for(int o=0;o<=m;o++){
				if(f+t+o==4&&f*5+t*2+o*1==13){
					sum++;
					std::cout<<"购买5元的"<<f<<"只"<<" "<<"购买2元的"<<t<<"只" <<" ""购买1元的"<<o<<"只"<<" ";  
				}
			}
		}
	}
	std::cout<<sum<<" ";
}