CCF认证 201812-1：小明上学(C++)

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
const int N=1000;
int main()
{
	int r,y,g,i,n,x,time,sum=0;
	cin>>r>>y>>g>>n;
	for(i=0;i<n;i++){
		cin>>x;
		cin>>time;
		if(x==0||x==1){
			sum+=time;
		}else if(x==2){
			time+=r;
			sum+=time;
		}
	}
	cout<<sum;
}