Submission #651441

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
651441	2022-10-18 18:30:07	aebov	Tents (JOI18_tents)	C++17	100 / 100	256 ms	70804 KiB

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#include<iostream>
#include<algorithm>
#include<vector>
#define ll long long
#define pb push_back
using namespace std;
const ll mod = (ll)1e9 + 7;
ll mul(ll a, ll b){
  return 1LL * (a%mod) * (b%mod) % mod;
}
ll add(ll a, ll b){
  return ((a%mod) + (b%mod) ) % mod;
}
const int N = (int)3002;
ll dp[N][N];
int n, m;
int main(){
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  cin >> n >> m;
  for(int i = 0; i <= n; i ++){
    for(int j = 0; j <= m; j ++){
      if(i == 0 || j == 0){
        dp[i][j]=  1;
        continue;
      }
      dp[i][j] = dp[i][j-1];
      dp[i][j] = add(dp[i][j], mul(1LL * i * 4, dp[i-1][j-1]));
 
 
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• Subtask 1: 48 / 48
• Subtask 2: 52 / 52