제출 #1294029

#제출 시각아이디문제언어결과실행 시간메모리
1294029esmabadal캥거루 (CEOI16_kangaroo)C++20
6 / 100
2095 ms572 KiB
#include <bits/stdc++.h> using namespace std; #define int long long const int MAX = 1e5 + 10; vector<int> vt[MAX]; void solve() { int n, a, b; cin >> n >> a >> b; vector<int> e; for(int i = 1; i <= n; i++) { if(i != a && i != b) { e.push_back(i); } } int ans = 0; do{ deque<int> vt; vt.push_back(a); for(int i = 0; i < e.size(); i++) { vt.push_back(e[i]); } int say = 0; vt.push_back(b); int k = vt.size(); for(int i = 1; i < k - 1; i++) { if(vt[i - 1] <= vt[i] && vt[i] <= vt[i + 1]) { say++; } } for(int i = 1; i <= k - 2; i++) { if(vt[i - 1] >= vt[i] && vt[i] >= vt[i + 1]) { say++; } } if(say == 0) { ans++; } }while(next_permutation(e.begin(), e.end())); cout << ans << endl; } signed main() { int t = 1; //cin >> t; while(t--) { solve(); } }
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