Submission #172808

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
172808	2020-01-02T16:23:07 Z	Akashi	Tents (JOI18_tents)	C++14	100 / 100	125 ms	35672 KB

tents

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

const int MOD = 1e9 + 7;

int n, m;
int d[3005][3005];

int main()
{
//    freopen("1.in", "r", stdin);

    scanf("%d%d", &n, &m);
    d[0][n] = 1;

    for(int c = 1; c <= m ; ++c){
        for(int l = 0; l <= n ; ++l){
            d[c][l] = d[c - 1][l];
            d[c][l] = (d[c][l] + 4LL * (l + 1) * d[c - 1][l + 1]) % MOD;
            d[c][l] = (d[c][l] + 1LL * (1LL * (l + 2) * (l + 1) / 2) % MOD * d[c - 1][l + 2]) % MOD;
            if(c > 1) d[c][l] = (d[c][l] + (1LL * (m - c + 1) * (l + 1)) % MOD * d[c - 2][l + 1]) % MOD;
        }
    }

    int Sol = -1;
    for(int l = 0; l <= n ; ++l)
        Sol = (Sol + d[m][l]) % MOD;
    printf("%d", Sol);

    return 0;
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	3 ms	1144 KB	Output is correct
3	Correct	2 ms	256 KB	Output is correct
4	Correct	3 ms	376 KB	Output is correct
5	Correct	3 ms	1400 KB	Output is correct
6	Correct	2 ms	760 KB	Output is correct
7	Correct	1 ms	1272 KB	Output is correct
8	Correct	2 ms	632 KB	Output is correct
9	Correct	2 ms	376 KB	Output is correct
10	Correct	3 ms	1144 KB	Output is correct
11	Correct	3 ms	1528 KB	Output is correct
12	Correct	5 ms	1912 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	376 KB	Output is correct
2	Correct	3 ms	1144 KB	Output is correct
3	Correct	2 ms	256 KB	Output is correct
4	Correct	3 ms	376 KB	Output is correct
5	Correct	3 ms	1400 KB	Output is correct
6	Correct	2 ms	760 KB	Output is correct
7	Correct	1 ms	1272 KB	Output is correct
8	Correct	2 ms	632 KB	Output is correct
9	Correct	2 ms	376 KB	Output is correct
10	Correct	3 ms	1144 KB	Output is correct
11	Correct	3 ms	1528 KB	Output is correct
12	Correct	5 ms	1912 KB	Output is correct
13	Correct	7 ms	7672 KB	Output is correct
14	Correct	1 ms	376 KB	Output is correct
15	Correct	82 ms	24104 KB	Output is correct
16	Correct	12 ms	7928 KB	Output is correct
17	Correct	25 ms	12408 KB	Output is correct
18	Correct	28 ms	11768 KB	Output is correct
19	Correct	94 ms	26616 KB	Output is correct
20	Correct	79 ms	25336 KB	Output is correct
21	Correct	57 ms	22008 KB	Output is correct
22	Correct	54 ms	18684 KB	Output is correct
23	Correct	28 ms	7672 KB	Output is correct
24	Correct	125 ms	35672 KB	Output is correct
25	Correct	98 ms	30584 KB	Output is correct
26	Correct	111 ms	32420 KB	Output is correct
27	Correct	122 ms	35336 KB	Output is correct