zoukankan      html  css  js  c++  java
  • codeforces 653A A. Bear and Three Balls(水题)

    题目链接:

    A. Bear and Three Balls

     

    time limit per test
    2 seconds
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    Limak is a little polar bear. He has n balls, the i-th ball has size ti.

    Limak wants to give one ball to each of his three friends. Giving gifts isn't easy — there are two rules Limak must obey to make friends happy:

    • No two friends can get balls of the same size.
    • No two friends can get balls of sizes that differ by more than 2.

    For example, Limak can choose balls with sizes 4, 5 and 3, or balls with sizes 90, 91 and 92. But he can't choose balls with sizes 5, 5and 6 (two friends would get balls of the same size), and he can't choose balls with sizes 30, 31 and 33 (because sizes 30 and 33 differ by more than 2).

    Your task is to check whether Limak can choose three balls that satisfy conditions above.

    Input

    The first line of the input contains one integer n (3 ≤ n ≤ 50) — the number of balls Limak has.

    The second line contains n integers t1, t2, ..., tn (1 ≤ ti ≤ 1000) where ti denotes the size of the i-th ball.

    Output

    Print "YES" (without quotes) if Limak can choose three balls of distinct sizes, such that any two of them differ by no more than 2. Otherwise, print "NO" (without quotes).

    Examples
    input
    4
    18 55 16 17
    output
    YES
    input
    6
    40 41 43 44 44 44
    output
    NO
    input
    8
    5 972 3 4 1 4 970 971
    output
    YES
    Note

    In the first sample, there are 4 balls and Limak is able to choose three of them to satisfy the rules. He must must choose balls with sizes18, 16 and 17.

    In the second sample, there is no way to give gifts to three friends without breaking the rules.

    In the third sample, there is even more than one way to choose balls:

    1. Choose balls with sizes 3, 4 and 5.
    2. Choose balls with sizes 972, 970, 971.

    题意:就是问你是否有连续的三个数;

    AC代码:

    #include <bits/stdc++.h>
    using namespace std;
    int a[1000],num[1005];
    int main()
    {
        int n;
        scanf("%d",&n);
        for(int i=0;i<n;i++)
        {
            scanf("%d",&a[i]);
            num[a[i]]++;
        }
        for(int i=1;i<=1000;i++)
        {
            if(num[i]&&num[i+1]&&num[i+2])
            {
                cout<<"YES";
                return 0;
            }
        }
        cout<<"NO";
        return 0;
    }
  • 相关阅读:
    netty同时做http和websocket(netty入门)
    curl的概念及相关工具下载
    当删除某一个jar包时tomcat中出现problem encountered while deleting resources问题
    一个servlet处理多个请求或者叫方法
    在web中实现当前变量和前一个的比较
    URL中可以出现的字符
    在Editplus直接运行程序的步骤
    socket的相关知识理解
    011 python接口 bs4提取结果
    010 python接口 bs4解析html
  • 原文地址:https://www.cnblogs.com/zhangchengc919/p/5296636.html
Copyright © 2011-2022 走看看