Submission #1034104

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1034104	2024-07-25 09:49:06	anHiep	Tents (JOI18_tents)	C++14	0 / 100	1 ms	348 KiB

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#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
int dp[3003][3003];
int dv;
int bp(int a, int b){
    if(b == 0) return 1;
    if(b == 1) return a;
    int k = bp(a, b/2);
    k = (k * k) % mod;
    if(b % 2 == 0) return k;
    return (a * k) % mod;
}
int cal(int i, int j){
    if(i < 0 || j < 0) return 0;
    if(dp[i][j] != 0) return dp[i][j];
    int ans = 0;
    ans = (ans + cal(i - 1, j)) % mod;
    ans = (ans + cal(i - 1, j - 2) * j % mod * (j - 1) % mod * dv % mod);
    ans = (ans + cal(i - 2, j - 1) * j % mod * (j - 1) % mod);
    ans = (ans + cal(i - 1, j - 1) * j % mod * 4 % mod);
    return dp[i][j] = ans;
}
 
 
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• Subtask 1: 0 / 48
• Subtask 2: 0 / 52