2015 AlBaath Collegiate Programming Contest A
Description
Tamer is traveling with his brother on a long highway. He sees a traffic light at a distance. He calculated that it will take him x seconds until he arrives at the traffic light, he also knows that the green light lasts for g seconds, the yellow light lasts for y seconds and the red light lasts for r seconds. Now he is wondering in what color will the light be when he arrives there?
You know he is now busy driving, so he asks you to tell him the answer! you know that the light has just turned green at the moment of his question, and that the sequence of the lights is: GREEN, YELLOW, RED and then GREEN and so on.
The first line of input contains one integer T - the number of test cases.
Each test case contains four integers x, g, y, r as described in the statement.
1 ≤ x, g, y, r ≤ 109
For each test case output a single word, "RED" or "YELLOW" or "GREEN" without the quotes.
3
5 5 2 8
7 5 2 8
16 5 2 8
YELLOW
RED
GREEN
In the samples the light changes as follows:
Light: g, g, g, g, g, y, y, r, r, r, r, r , r , r , r , g , g , g , g ...
Time : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18...
题意:告诉我们红绿灯三种颜色的时间变化,告诉一个总时间,问经过时应该是哪种颜色
解法:总时间%红绿灯变化总时间,讨论余
#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
int a,b,c,d;
cin>>t;
while(t--)
{
cin>>a>>b>>c>>d;
int mod=a%(b+c+d);
if(mod<b)
{
cout<<"GREEN"<<endl;
}
else if(mod>=b&&mod<b+c)
{
cout<<"YELLOW"<<endl;
}
else
{
cout<<"RED"<<endl;
}
}
return 0;
}
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