求助

没吸氧50吸氧85

#include <cstdio>
#include <iostream>

using namespace std;
int n;
int a1,a2,a3,minn;
bool flag=1;
int main(){
    freopen("order.in","r",stdin);
    freopen("order.out","w",stdout);
    scanf("%d",&n);
    for(int a=0;a<n/7;a++){
        for(int b=0;b<n/4;b++){
            int c=(n-a*7-b*4)/3;
            if(7*a+4*b+3*c==n&&flag) flag=0,a1=a,a2=b,a3=c,minn=min(min(a,b),c);
            else if(7*a+4*b+3*c==n&&!flag){
                if(min(min(a,b),c)>minn) a1=a,a2=b,a3=c,minn=min(min(a,b),c);
                else if(min(min(a,b),c)==minn){
                    if(a+b+c>a1+a2+a3) a1=a,a2=b,a3=c,minn=min(min(a,b),c);
                }
            }
        }
    }
    if(!flag) printf("%d %d %d",a1,a2,a3);
    else printf("-1");
    return 0;
}

思路就是用 a1,a2,a3 存储答案，若没有答案(即 flag=0) 输出 -1，符合条件的挨个比较。