A. Dasha and Stairs

題目連接：

http://codeforces.com/contest/761/problem/A

Description

On her way to programming school tiger Dasha faced her first test — a huge staircase!

The steps were numbered from one to infinity. As we know, tigers are very fond of all striped things, it is possible that it has something to do with their color. So on some interval of her way she calculated two values — the number of steps with even and odd numbers.

You need to check whether there is an interval of steps from the l-th to the r-th (1?≤?l?≤?r), for which values that Dasha has found are correct.

Input

In the only line you are given two integers a, b (0?≤?a,?b?≤?100) — the number of even and odd steps, accordingly.

Output

In the only line print "YES", if the interval of steps described above exists, and "NO" otherwise.

Sample Input

2 3

Sample Output

YES

Hint

題意

問你在現實生活中，存不存在一個起點和一個終點，使得里面的奇數有a個，偶數有b個。

題解：

1.暴力枚舉

2.abs<=1即可，然后特判掉0 0這個數據，這個答案是no

代碼

#include<bits/stdc++.h> using namespace std;int main() {long long a,b;cin>>a>>b;for(int l=0;l<=1000;l++){for(int r=l;r<=1000;r++){int L=0,R=0;for(int k=l;k<=r;k++){if(k%2==0)R++;else L++;}if(L==a&&R==b){cout<<"YES"<<endl;return 0;}}}cout<<"NO"<<endl;return 0; }

轉載于:https://www.cnblogs.com/qscqesze/p/6359964.html

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