Submission #838954

#	Time	Username	Problem	Language	Result	Execution time	Memory
838954		rahidilbayramli	Kangaroo (CEOI16_kangaroo)	C++17	6 / 100	2066 ms	300 KiB

kangaroo

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define vi vector<int>
#define vl vector<ll>
#define all(v) v.begin(), v.end()
#define pb push_back
#define f first
#define s second
#define pii pair<int, int>
#define pll pair<ll, ll>
using namespace std;
int main()
{
    ll n, cs, cf, i, j, ans = 0, k = 0;
    cin >> n >> cs >> cf;
    int v[n+1];
    for(i = 1; i <= n; i++)
        v[i] = i;
    while(next_permutation(v+1, v+n+1))
    {
        k = 0;
        if(v[1] == cs && v[n] == cf)
        {
            k = 2;
            for(i = 2; i <= n - 1; i++)
            {
                if((v[i] > v[i-1] && v[i] > v[i+1]) || (v[i] < v[i-1] && v[i] < v[i+1]))
                    k++;
            }
            if(k == n)
                ans++;
            ans %= 1000000007;
        }
    }
    cout << ans << "\n";
}

Compilation message (stderr)

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:15:22: warning: unused variable 'j' [-Wunused-variable]
   15 |     ll n, cs, cf, i, j, ans = 0, k = 0;
      |                      ^

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