Submission #1294249

#	Time	Username	Problem	Language	Result	Execution time	Memory
1294249		eldaees131313	Kangaroo (CEOI16_kangaroo)	C++20	6 / 100	2095 ms	572 KiB

kangaroo

////////////////////////////// Author:eldaee, coder_viper!!!!!!!!!!!!!!!!!!!!!!!!11
#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>
#define int long long
#define str string
#define vec vector
#define dou double
#define ld long double
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define YES cout << "YES" << '\n'
#define Yes cout << "Yes" << '\n'
#define NO cout << "NO" << '\n'
#define No cout << "No" << '\n'
#define gcd __gcd
#define all(x) x.begin(),x.end()
#define eldaee ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#include <bits/stdc++.h>
/*


*/

using namespace std;

void solve() {

    int n, cs, cf;
    cin >> n >> cs >> cf;
    vec<int> v(n);
    for (int i = 0; i < n; i++) {
        v[i] = i + 1;
    }
    int res = 0;
    while(true) {
        if (v[0] == cs && v[n - 1] == cf) {
            bool fl = true;
            for (int i = 1; i < n - 1; i++) {
                if ((v[i - 1] < v[i] && v[i] < v[i + 1]) || (v[i - 1] > v[i] && v[i] > v[i + 1])) {
                    fl = false;
                    break;
                }
            }
            if (fl) {
                res++;
            }
        }
        int i = n - 2;
        while(i >= 0 && v[i] >= v[i + 1]) {
            i--;
        }
        if (i < 0) {
            break;
        }
        int j = n - 1;
        while(v[j] <= v[i]) {
            j--;
        }
        swap(v[i], v[j]);
        reverse(v.begin() + i + 1, v.end());
    }
    cout << res << '\n';
}

signed main()
{
    eldaee

    solve();
}

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