AtCoder Beginner Contest 178

過去最低パフォーマンスを計測したコンテストです。
戒めとして記憶に残したいと思います。

A - Not

C++

# include<iostream>
# include<vector>
# include<algorithm>
# include<iomanip>
# include<utility>
# include<iomanip>
# include<map>
# include<queue>
# include<cmath>
# include<cstdio>
 
# define rep(i,n) for(int i=0; i<(n); ++i)
# define pai 3.1415926535897932384
 
using namespace std;
using ll =long long;
using P = pair<int,int>;
 
int main(int argc, const char * argv[]) {
    
    int a;
    cin >> a;
    
    if(a==0) cout << 1 << endl;
    else cout << 0 << endl;
    
    return 0;
}

B - Product Max

C++

# include<iostream>
# include<vector>
# include<algorithm>
# include<iomanip>
# include<utility>
# include<iomanip>
# include<map>
# include<queue>
# include<cmath>
# include<cstdio>
 
# define rep(i,n) for(int i=0; i<(n); ++i)
# define pai 3.1415926535897932384
 
using namespace std;
using ll =long long;
using P = pair<int,int>;
 
int main(int argc, const char * argv[]) {
    
    ll a, b, c, d;
    cin >> a >> b >> c >> d;
    
    ll Ans = -9223372036854775808;
    
    Ans = max(a*c, Ans);
    Ans = max(a*d, Ans);
    Ans = max(b*c, Ans);
    Ans = max(b*d, Ans);
    
    cout << Ans << endl;
    
    return 0;
}