AtCoder Beginner Contest 179

A - Plural Form

Python

S = str(input())
 
if S[len(S)-1] == 's':
    print(S + 'es')
else:
    print(S + 's')

B - Go to Jail

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 N;
    cin >> N;
    
    vector<int> d1(N);
    vector<int> d2(N);
    
    int Ans = 0;
    int sum = 0;
    for(int i=0; i<N; i++){
        cin >> d1[i] >> d2[i];
        
        if(d1[i] == d2[i]){
            sum++;
            Ans = max(Ans, sum);
        }else{
            sum=0;
        }
    }
    
    if(Ans>=3) cout << "Yes" << endl;
    else cout << "No" << endl;
    
    return 0;
}

C - A x B + C

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 N;
    cin >> N;
    
    ll Ans = 0;
    for(ll A=1; A<N; A++){
        for(ll B=1; A*B<N; B++){
            ll C = N - (A * B);
            if(C > 0) Ans++;
        }
    }
    
    cout << Ans << endl;
    
    return 0;
}