Submission #1033965

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1033965	2024-07-25 08:08:47	vjudge1	Tents (JOI18_tents)	C++17	100 / 100	213 ms	71300 KiB

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#include <bits/stdc++.h>
#define int long long
#define fi first
#define pll pair<long long, long long>
#define se second
#define isz(a) (int)a.size()
using namespace std;
const long long inf = 1e18;
const int maxn = 3e3 + 5;
const int mod = 1e9 + 7;
int n, m, divi;
int cc[maxn][maxn];
long long binpow(int x, int y){
    long long ans = 1;
    while (y){
        if (y & 1) ans = ans * x % mod;
        x = x * x % mod; y >>= 1;
    }
    return ans;
}
int dp(int i, int j){
    if (i < 0 || j < 0) return 0;
    if (cc[i][j] != -1) return cc[i][j];
    int ans = 0;
    ans += dp(i - 1, j); ans %= mod;
    ans += dp(i - 1, j - 2) * j % mod * (j - 1) % mod * divi % mod; ans %= mod;
 
 
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• Subtask 1: 48 / 48
• Subtask 2: 52 / 52