Submission #1679101

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Source Code Expand

#include <bits/stdc++.h>
#include <stdio.h>
using namespace std;

#define INF 1.1e9
#define LINF 1.1e18
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(), (v).end()

typedef long long ll;
typedef pair<ll, int> P;

ll n,m;

int main(){
	//cin.tie(0);
	//ios::sync_with_stdio(false);

	cin>>n>>m;
	if(m<2||(m<4&&n<0)) {
		cout<<'0'<<endl;
		return 0;
	}
	ll ans=0;
	while (n>0) {
		ans++;n--;m-=2;
		if(m<0) {
			ans--; break;
		}
	}
	while (m>0) {
		ans++;m-=4;
		if(m<0) {
			ans--; break;
		}
	}
	cout<<ans<<endl;

	return 0;
}

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