题解 100% AC

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,a[100010],b[100010],cnt=0;cin>>n;
    for(int i=1;i<=n;i++){
    	cin>>a[i];
    }
    for(int i=1;i<=n;i++){
    	cin>>b[i];
    }
    for(int i=1;i<=n;i++){
    	if(a[i]>b[i])cnt+=3;
        else if(a[i]<b[i])cnt-=3;
    }
    cout<<cnt;
	return 0;
}