codeforces 519C C. A and B and Team Training(枚举)

题目链接：

题目大意：

题目分析：

AC代码：

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

using namespace std;

int n,m;
const int MAX = 5*1e5;

int main ( )
{
    while ( ~scanf ( "%d%d" , &n , &m ) )
    {
        int ans = 0;
        for ( int i = 0 ; i <= MAX ; i++ )
        {
            if( 2*i > n ) break;
            if ( i > m ) break;
            int x = n -2*i;
            int y = m - i;
            ans = max ( ans , i+min(x,y/2));
        }
        printf ( "%d\n" , ans );
    }
}