제출 #913949

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
913949	2024-01-20 16:02:24	penguin133	Tents (JOI18_tents)	C++17	100 / 100	197 ms	71568 KiB

tents

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#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
int memo[3005][3005];
const int mod = 1e9 + 7;
int dp(int x, int y){
  if(x <= 0 || y <= 0)return 1;
  if(memo[x][y] != -1)return memo[x][y];
  return memo[x][y] = (y * (y - 1) / 2 % mod * dp(x - 1, y - 2) % mod + (x - 1) * y  % mod * dp(x - 2, y - 1) % mod + 4 * y * dp(x - 1, y - 1) % mod + dp(x - 1, y) % mod)% mod;
}
void solve(){
  int n, m; cin >> n >> m;
  memset(memo, -1, sizeof(memo));
  cout << (dp(n, m) - 1 + mod) % mod << '\n';
}
main(){
  ios::sync_with_stdio(0);cin.tie(0);
 
 
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컴파일 시 표준 에러 (stderr) 메시지

tents.cpp:29:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   29 | main(){
      | ^~~~

• Subtask 1: 48 / 48
• Subtask 2: 52 / 52