D - Problem D. Nothing is Impossible HDU - 6335

https://vjudge.net/contest/313233#problem/D

Input

The first line of the input contains an integer TT (1≤T≤100)(1≤T≤100) denoting the number of test cases. 
Each test case starts with two integers n,m (1≤n≤100,1≤m≤109)(1≤n≤100,1≤m≤109), denoting the number of problems and the number of students. Each of next nn lines contains two integers ai,biai,bi （ 1≤bi≤100,ai=11≤bi≤100,ai=1）, indicating the number of correct answers and the number of incorrect answers of the ii-th problem.

Output

For each test case, print an integer denoting the maximum size of SS. 
Sample Input

2	
3 5
1 3
1 3
1 3
5 50
1 1
1 3
1 2
1 3
1 5

Sample Output

1
3

题意：
N 个题 M 次作答（依次作答，每题可重复作答）
每个题的正确/错误答案分布在下面 N 行给出
每个题在取过所有的错误答案后才会有一个正确答案。
问最终选中正确答案的个数

要让一道题的所有错误答案都被选中，才能保证至少选对一个正确答案。

code

#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
    int t;
    int n , m;
    cin >> t;
    while(t--)
    {
        cin >> n >> m;
        int b[110] = {0};
        for(int i = 0;i<n;i++)
            scanf("%*d%d" , &b[i]);
        sort(b , b+n);
        int sum = 0;
        for(int i = 0;i<n;i++)
        {
            if(m < b[i]+1)
                break;
            m /= b[i]+1;
            sum++;
        }
        cout << sum << endl;
    }
    return 0;
}