Submission #1114688

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
//debug
#ifdef grief
#define debug(...) do{\
	fprintf(stderr , "%s - %d : (%s) = " , __PRETTY_FUNCTION__ , __LINE__ , #__VA_ARGS__ );\
	_DO(__VA_ARGS__);\
}while(0)
template<typename I> void _DO(I&&x){
	cerr<<x<<endl;
}
template<typename I,typename...T> void _DO(I&&x,T&&...tail){
	cerr<<x<<" , ";
	_DO(tail...);
}
#else
#define debug(...)
#endif
//type
typedef long long ll;
typedef pair<int,int> pii;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef priority_queue<pll,vector<pll>,greater<pll> > heap;
//macro
#define SZ(x) ((ll)(x).size())
#define ALL(x) (x).begin(),(x).end()
#define F first
#define S second
#define REP(i,n) for(ll i=0;i<(n);i++)
#define REP1(i,a,b) for(ll i=(a);i<=(b);i++)
#define mkp make_pair
#define pb push_back
const ll INF=1e18;
const ll MA=1e6+5;
const ll MOD=1e9+7;
//}}}
ll n,m;
ll ans;
int main(){
	cin>>n>>m;
	ans=min(n,m/2);
	n-=ans; m-=ans*2;
	ans+=m/4;
	cout<<ans<< '\n';
	
	return 0;
}

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