Submission #895487

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
895487	2023-12-30 03:18:23	box	Ruins 3 (JOI20_ruins3)	C++17	100 / 100	158 ms	3416 KiB

ruins3

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#include <bits/stdc++.h>
using namespace std;
#define ar array
#define sz(v) int(std::size(v))
using i64 = long long;
const int MAXN = 606;
const int MOD = 1e9 + 7;
int N;
bool use[MAXN * 2];
int take[MAXN][MAXN];
int nck[MAXN][MAXN];
int dp[MAXN + 1], ndp[MAXN + 1];
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> N;
    for (int i = 0; i < N; i++) {
        int x;
        cin >> x;
        use[x] = 1;
    }
    take[0][0] = 1;
    for (int n = 1; n <= N; n++) for (int k = 0; k <= n; k++) {
        i64 x = take[n - 1][k];
        if (k >= 1) x += (i64) take[n - 1][k - 1] * 2 * k;
        if (k >= 2) x += (i64) take[n - 1][k - 2] * k * (k - 1);
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 52 / 52
• Subtask 3: 42 / 42