Submission #1114953

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Source Code Expand

#include <bits/stdc++.h>
  
using namespace std;
  
#define rep(i,n) REP(i,0,n)
#define REP(i,s,e) for(int i=(s); i<(int)(e); i++)
#define pb push_back
#define all(r) r.begin(),r.end()
#define rall(r) r.rbegin(),r.rend()
#define fi first
#define se second
  
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
const int INF = 1e9;
const ll MOD = 1e9 + 7;
double EPS = 1e-8;

int main(){
	ll n, m;
	cin>>n>>m;
	ll l = 0LL, r = 1e12;
	rep(i, 64){
		ll mid = (l + r) /2;
		ll k = m - mid * 2;
		if(k < 0 || (k / 2+ n < mid)) r = mid;
		else l = mid;
	}
	cout<<l<<endl;
}

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