hdu 2566 统计硬币

 1 #include <iostream>
 2 #include <cstdio>
 3 using namespace std;
 4 
 5 const int MAXN=1000000;
 6 
 7 int main(){
 8     int t,n,m;
 9     scanf("%d",&t);
10     while(t--){
11         scanf("%d %d",&n,&m);
12         int left,right,money;
13         int ans=0;
14         for(int i=0;i<=n;i++){
15             left=(n-i);
16             right=2*(n-i);
17             money = m- i*5;
18             if(money>=left && money<=right)ans++;
19         }
20         printf("%d\n", ans);
21     }
22 }