CCF 201812-2 小明放学

数据类型一定要用long,哭了

import java.util.Scanner;

public class T4{
	public static void main(String[] args) {
		long r=0,y=0,g=0,n=0,k=0,t=0;
		long sum=0;
		int i=0;
		
		Scanner sc = new Scanner(System.in);
		r = sc.nextInt();
		y = sc.nextInt();
		g = sc.nextInt();
		n = sc.nextInt();
		
		for(i=0;i<n;i++) {
			k=sc.nextInt();
			t=sc.nextInt();
			if(k==0) {
				sum = sum+t;
			//	System.out.println(sum);
			}
			//红灯
			else if(k==1) {
				//红灯等待
				if(sum%(r+y+g)<t) sum = sum+t-sum%(r+y+g);
				//绿灯直接通过
				else if(sum%(r+y+g)>=t&&sum%(r+y+g)<t+g) sum = sum+0;
				//黄灯+红灯等待
				else sum = sum+g+r+y+t-sum%(r+y+g);
			//	System.out.println(sum);
			}
			//黄灯
			else if(k==2) {
				//黄灯和红灯等待
				if(sum%(r+y+g)<t+r) sum = sum+t+r-sum%(r+y+g);
				//绿灯直接通过
				else if(sum%(r+y+g)>=t+r&&sum%(r+y+g)<t+r+g) sum = sum+0;
				
				else sum = sum+2*r+g+y+t-sum%(r+y+g);
			//	System.out.println(sum);
			}
			//绿灯
			else if(k==3) {
				//绿灯通过
				if(sum%(r+y+g)<t) sum = sum+0;
				else if(sum%(r+y+g)>=t+r+y) sum = sum+0;
				//需要等待
				else sum = sum+r+y+t-sum%(r+y+g);
			//	System.out.println(sum);
			}
		}
		sc.close();
		System.out.println(sum);
	}
}