#include <iostream>
using namespace std;
int a[12],totm=0,tot=0;
int main(){
    for(int i=0;i<=11;i++){
        tot+=300;
        cin>>a[i];
        if(tot-a[i]<0){
        	cout<<"-"<<i+1<<endl;
            return 0;
        }
        tot-=a[i];
        while(tot>100) tot-=100,totm+=100;
    }
    cout<<1.2*totm+tot<<endl;
    return 0;
}

这是一个简单的做法

#include <iostream>
using namespace std;
int a[12],totm=0,tot=0;
int main(){
    for(int i=0;i<=11;i++){
        tot+=300;
        cin>>a[i];
        if(tot-a[i]<0){
        	cout<<"-"<<i+1<<endl;
            return 0;
        }
        tot-=a[i];
        while(tot>100) tot-=100,totm+=100;
    }
    cout<<1.2*totm+tot<<endl;
    return 0;
}

#include using namespace std; int a[12],totm=0,tot=0; int main(){ for(int i=0;i<=11;i++){ tot+=300; cin>>a[i]; if(tot-a[i]<0){ cout<<"-"<<i+1<<endl; return 0; } tot-=a[i]; while(tot>100) tot-=100,totm+=100; } cout<<1.2*totm+tot<<endl; return 0; }