AtCoder Beginner Contest 082 A

题目链接：https://abc082.contest.atcoder.jp/tasks/abc082_a

Time limit : 2sec / Memory limit : 256MB

Score : 100 points

Problem Statement

You are given two positive integers a and b. Let x be the average of a and b. Print x rounded up to the nearest integer.

Constraints

• a and b are integers.
• 1≤a,b≤100

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Input

Input is given from Standard Input in the following format:

a b

Output

Print x rounded up to the nearest integer.

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Sample Input 1

Copy

1 3

Sample Output 1

Copy

2

The average of 1 and 3 is 2.0, and it will be rounded up to the nearest integer, 2.

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Sample Input 2

Copy

7 4

Sample Output 2

Copy

6

The average of 7 and 4 is 5.5, and it will be rounded up to the nearest integer, 6.

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Sample Input 3

Copy

5 5

Sample Output 3

Copy

5

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#include <iostream>
#include <cstdio>
#include <algorithm>
#include <stack>
#include <string>
#include <cstring>
#include <cmath>
#include <cstdio>
using namespace std;
int main()
{
    int a,b;
    while(cin>>a>>b){
        if((a+b)%2==0) cout<<(a+b)/2<<endl;
        else{
            int c=(a+b)/2;
            if(a+b-2*c<=1) cout<<c+1<<endl;
            else cout<<c<<endl;
        }
    }
    return 0;
}