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Submission #44367

# Submission time Handle Problem Language Result Execution time Memory
44367 2018-04-01T06:12:55 Z choikiwon Tents (JOI18_tents) C++17
100 / 100
 429 ms 36324 KB 
#include<bits/stdc++.h>
using namespace std;

const int mod = 1e9 + 7;

int H, W;

int cc[3010][3010];
int dp(int r, int c) {
    int &ret = cc[r][c];
    if(ret != -1) return ret;
    if(!r || !c) return ret = 1;

    ret = 0;
    ret += dp(r - 1, c);
    ret %= mod;
    if(r >= 1) {
        ret += 1LL * 4 * c % mod * dp(r - 1, c - 1) % mod;
        ret %= mod;
    }
    if(r >= 2) {
        ret += 1LL * (r - 1) * c % mod * dp(r - 2, c - 1) % mod;
        ret %= mod;
    }
    if(c >= 2) {
        ret += 1LL * (c * (c - 1) / 2) * dp(r - 1, c - 2) % mod;
        ret %= mod;
    }
    return ret;
}

int main() {
    scanf("%d %d", &H, &W);

    memset(cc, -1, sizeof(cc));
    printf("%d", dp(H, W) - 1);
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &H, &W);
     ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 35832 KB Output is correct
2 Correct 26 ms 35832 KB Output is correct
3 Correct 26 ms 36000 KB Output is correct
4 Correct 27 ms 36008 KB Output is correct
5 Correct 26 ms 36008 KB Output is correct
6 Correct 26 ms 36008 KB Output is correct
7 Correct 27 ms 36020 KB Output is correct
8 Correct 27 ms 36052 KB Output is correct
9 Correct 26 ms 36052 KB Output is correct
10 Correct 29 ms 36068 KB Output is correct
11 Correct 26 ms 36068 KB Output is correct
12 Correct 29 ms 36068 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 35832 KB Output is correct
2 Correct 26 ms 35832 KB Output is correct
3 Correct 26 ms 36000 KB Output is correct
4 Correct 27 ms 36008 KB Output is correct
5 Correct 26 ms 36008 KB Output is correct
6 Correct 26 ms 36008 KB Output is correct
7 Correct 27 ms 36020 KB Output is correct
8 Correct 27 ms 36052 KB Output is correct
9 Correct 26 ms 36052 KB Output is correct
10 Correct 29 ms 36068 KB Output is correct
11 Correct 26 ms 36068 KB Output is correct
12 Correct 29 ms 36068 KB Output is correct
13 Correct 27 ms 36068 KB Output is correct
14 Correct 28 ms 36196 KB Output is correct
15 Correct 238 ms 36324 KB Output is correct
16 Correct 29 ms 36324 KB Output is correct
17 Correct 62 ms 36324 KB Output is correct
18 Correct 75 ms 36324 KB Output is correct
19 Correct 316 ms 36324 KB Output is correct
20 Correct 209 ms 36324 KB Output is correct
21 Correct 147 ms 36324 KB Output is correct
22 Correct 180 ms 36324 KB Output is correct
23 Correct 111 ms 36324 KB Output is correct
24 Correct 429 ms 36324 KB Output is correct
25 Correct 293 ms 36324 KB Output is correct
26 Correct 339 ms 36324 KB Output is correct
27 Correct 368 ms 36324 KB Output is correct