Submission #1453333

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Source Code Expand

#include<functional>
#include<algorithm>
#include<iostream>
#include<utility>
#include<string>
#include<vector>
#include<cmath>
#include<stack>
#include<queue>
#define rep(i,n) for(int i=0;i<n;i++)
#define loop(i,x,n) for(int i=x;i<n;i++)
#define pb push_back
#define int long long
using namespace std;
const int INF=1000000007;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

signed main(){
  int n,m;
  cin>>n>>m;
  if(m<n*2){
    cout<<m/2<<endl;
  }else{
    int rest=m-2*n;
    cout<<(n+rest/4)<<endl;
  }

  return 0;
}

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