Submission #134029

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
134029	2019-07-22 00:22:23	tutis	Tents (JOI18_tents)	C++17	100 / 100	175 ms	31324 KiB

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/*input
4 3
*/
#pragma GCC optimize ("O3")
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const ll modulo = 1000000007;
ll M[3030][3030];
ll f(ll w, ll h)
{
  if (w > h)
    swap(w, h);
  if (M[w][h] != 0)
    return M[w][h];
  if (w == 0)
    return 1;
  if (w == 1)
    return h * (h - 1) / 2 + 4 * h + 1;
  ll ret = f(w, h - 1);
  ret += f(w - 2, h - 1) * ((w) * (w - 1) / 2);
  ret %= modulo;
  ret += f(w - 1, h - 1) * w * 4;
  ret %= modulo;
  ret += f(w - 1, h - 2) * w * (h - 1);
  ret %= modulo;
  return M[w][h] = ret;
}
int main()
 
 
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• Subtask 1: 48 / 48
• Subtask 2: 52 / 52