【codeforces 750A】New Year and Hurry

最新推荐文章于 2022-07-10 20:26:13 发布

转载最新推荐文章于 2022-07-10 20:26:13 发布 · 147 阅读

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原文链接：http://www.cnblogs.com/vocaloid01/p/9514270.html

此问题是关于一名参赛者如何在限定时间内解决尽可能多的问题，并确保能够及时参加新年派对。参赛者需要解决不同难度级别的问题，每个问题所需的时间依次增加。任务是确定参赛者在确保按时到达派对的前提下，最多可以解决多少个问题。

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Limak is going to participate in a contest on the last day of the 2016. The contest will start at 20:00 and will last four hours, exactly until midnight. There will be n problems, sorted by difficulty, i.e. problem 1 is the easiest and problem n is the hardest. Limak knows it will take him 5·i minutes to solve the i-th problem.

Limak’s friends organize a New Year’s Eve party and Limak wants to be there at midnight or earlier. He needs k minutes to get there from his house, where he will participate in the contest first.

How many problems can Limak solve if he wants to make it to the party?
Input
The only line of the input contains two integers n and k (1 ≤ n ≤ 10, 1 ≤ k ≤ 240) — the number of the problems in the contest and the number of minutes Limak needs to get to the party from his house.

Output
Print one integer, denoting the maximum possible number of problems Limak can solve so that he could get to the party at midnight or earlier.

Example
Input
3 222
Output
2
Input
4 190
Output
4
Input
7 1
Output
7
Note
In the first sample, there are 3 problems and Limak needs 222 minutes to get to the party. The three problems require 5, 10 and 15 minutes respectively. Limak can spend 5 + 10 = 15 minutes to solve first two problems. Then, at 20:15 he can leave his house to get to the party at 23:57 (after 222 minutes). In this scenario Limak would solve 2 problems. He doesn’t have enough time to solve 3 problems so the answer is 2.

In the second sample, Limak can solve all 4 problems in 5 + 10 + 15 + 20 = 50 minutes. At 20:50 he will leave the house and go to the party. He will get there exactly at midnight.

In the third sample, Limak needs only 1 minute to get to the party. He has enough time to solve all 7 problems.

水题，不多说了。
代码：

#include <cstdio>
#include <cstring>
#include <iostream>

using namespace std;

int main(){
    int N,K;
    cin>>N>>K;
    int T = 240 - K;
    int sum = 0;
    for(int i=1 ; i<=N ; i++){
        if(T>=i*5){
            sum++;
            T -= i*5;
        }
        else break;
    }
    printf("%d",sum);
    return 0;
}

转载于:https://www.cnblogs.com/vocaloid01/p/9514270.html