Submission #984023

#	Time	Username	Problem	Language	Result	Execution time	Memory
984023		irmuun	Kangaroo (CEOI16_kangaroo)	C++17	6 / 100	2076 ms	348 KiB

kangaroo

#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

const ll mod=1e9+7;

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll n,cs,cf;
    cin>>n>>cs>>cf;
    vector<ll>v(n);
    iota(all(v),1);
    ll ans=0;
    do{
        if(v[0]!=cs||v[n-1]!=cf) continue;
        bool ok=true;
        for(ll i=1;i<n-1;i++){
            if(max(v[i-1],v[i+1])<v[i]||min(v[i-1],v[i+1])>v[i]) continue;
            ok=false;
        }
        if(ok) ans++;
    }while(next_permutation(all(v)));
    cout<<ans;
}

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