[백준] 2875번 : 대회 or 인턴 - C++

https://www.acmicpc.net/problem/2875

#include <iostream>

using namespace std;

int main() {
    int n,m,k;
    cin >> n >> m >> k;
    
    int c=n/2;
    
    int count=c>m?m:c;
    int re=n+m-3*count;
    n=n-2*count;
    m=m-count;
    k-=re;
    
    if(k>0){
        int a=k/3;
        int b=k%3;
        
        if(b==0) count-=a;
        else count-=a+1;
    }
    cout << count;
}