Submission #1117880

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117880		vjudge1	Kangaroo (CEOI16_kangaroo)	C++14	0 / 100	1 ms	336 KiB

kangaroo

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

#define endl '\n'
#define pb push_back
#define F first
#define S second
#define ll long long
#define int ll
#define pii pair<int, int>
#define io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define M_PI 3.14159265358979323846
#define all(v) v.begin(), v.end()
#define pss pair<string, string>
#define no cout<<"No"<<endl;
#define yes cout<<"Yes"<<endl;
#define imp cout<<-1<<endl;
#define flu cout.flush();
#define Endl endl

const int N = 100009;
const int mod = 1e9+7;

int fac(int n){
    int ans=1;
    for(int i=1; i<=n; i++){
        ans*=i%mod;
    }
    return ans%mod;
}

int cam(int n, int r){
    return (fac(n)%mod)/(fac(r)%mod*fac(n-r)%mod)%mod;
}

void solve(){
    int n, st, fi;
    cin>>n>>st>>fi;
    cout<<__gcd(cam(n, st), cam(n, fi));
}

signed main(){
    io;
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 30
• Subtask 3: 0 / 15
• Subtask 4: 0 / 49