답안 #101639

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
101639	2019-03-19T05:49:44 Z	KCSC	Tents (JOI18_tents)	C++14	100 / 100	289 ms	35832 KB

tents

#include <bits/stdc++.h>
using namespace std;

const int DIM = 3005;
const int MOD = 1000000007;

int dp[DIM][DIM];

int solve(int n, int m) {
    if (n < 0 || m < 0) {
        return 0; }
    if (n == 0 || m == 0) {
        return 1; }
    if (dp[n][m] != -1) {
        return dp[n][m]; }
    long long ans = 0;
    ans += solve(n - 1, m);
    ans += 4LL * solve(n - 1, m - 1) * m;
    ans += 1LL * solve(n - 1, m - 2) * m * (m - 1) / 2;
    ans += 1LL * solve(n - 2, m - 1) * m * (n - 1);
    return dp[n][m] = ans % MOD; }

int main(void) {
  //  freopen("tents.in", "r", stdin);
  //  freopen("tents.out", "w", stdout);
    int n, m; cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= m; ++j) {
            dp[i][j] = -1; } }
    cout << (solve(n, m) - 1 + MOD) % MOD;
    return 0; }

Subtask #1

48.0 / 48.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	384 KB	Output is correct
2	Correct	2 ms	384 KB	Output is correct
3	Correct	2 ms	512 KB	Output is correct
4	Correct	3 ms	1152 KB	Output is correct
5	Correct	3 ms	640 KB	Output is correct
6	Correct	4 ms	1408 KB	Output is correct
7	Correct	3 ms	768 KB	Output is correct
8	Correct	4 ms	1408 KB	Output is correct
9	Correct	3 ms	896 KB	Output is correct
10	Correct	4 ms	1664 KB	Output is correct
11	Correct	2 ms	384 KB	Output is correct
12	Correct	6 ms	1920 KB	Output is correct

Subtask #2

52.0 / 52.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	384 KB	Output is correct
2	Correct	2 ms	384 KB	Output is correct
3	Correct	2 ms	512 KB	Output is correct
4	Correct	3 ms	1152 KB	Output is correct
5	Correct	3 ms	640 KB	Output is correct
6	Correct	4 ms	1408 KB	Output is correct
7	Correct	3 ms	768 KB	Output is correct
8	Correct	4 ms	1408 KB	Output is correct
9	Correct	3 ms	896 KB	Output is correct
10	Correct	4 ms	1664 KB	Output is correct
11	Correct	2 ms	384 KB	Output is correct
12	Correct	6 ms	1920 KB	Output is correct
13	Correct	2 ms	256 KB	Output is correct
14	Correct	11 ms	9856 KB	Output is correct
15	Correct	196 ms	33144 KB	Output is correct
16	Correct	7 ms	2688 KB	Output is correct
17	Correct	26 ms	8064 KB	Output is correct
18	Correct	56 ms	11136 KB	Output is correct
19	Correct	218 ms	34808 KB	Output is correct
20	Correct	164 ms	29440 KB	Output is correct
21	Correct	101 ms	19956 KB	Output is correct
22	Correct	101 ms	22492 KB	Output is correct
23	Correct	70 ms	19960 KB	Output is correct
24	Correct	289 ms	35832 KB	Output is correct
25	Correct	195 ms	31076 KB	Output is correct
26	Correct	213 ms	33784 KB	Output is correct
27	Correct	240 ms	35020 KB	Output is correct