Submission #83454

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
83454	2018-11-08T01:09:27 Z	tincamatei	Tents (JOI18_tents)	C++14	100 / 100	141 ms	36224 KB

tents

#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 3000;
const int MOD = 1000000007;
int dp[1+MAX_N][1+MAX_N];

int main() {
#ifdef HOME
	FILE *fin = fopen("input.in", "r");
	FILE *fout = fopen("output.out", "w");
#else
	FILE *fin = stdin;
	FILE *fout = stdout;
#endif
	
	int n, m;
	fscanf(fin, "%d%d", &n, &m);
	
	for(int i = 0; i <= MAX_N; ++i)
		dp[0][i] = dp[i][0] = 1;
	
	for(int i = 1; i <= MAX_N; ++i)
		for(int j = 1; j <= MAX_N; ++j) {
			dp[i][j] = ((long long)dp[i - 1][j - 1] * j * 4) % MOD;
			if(i >= 2) dp[i][j] = ((long long)dp[i - 2][j - 1] * (i - 1) * j + dp[i][j]) % MOD;
			if(j >= 2) dp[i][j] = ((long long)dp[i - 1][j - 2] * j * (j - 1) / 2 + dp[i][j]) % MOD;
			dp[i][j] = ((long long)dp[i - 1][j] + dp[i][j]) % MOD;
		}
	
	fprintf(fout, "%d", (dp[n][m] - 1 + MOD) % MOD);

#ifdef HOME
	fclose(fin);
	fclose(fout);
#endif
	return 0;
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:19:8: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  fscanf(fin, "%d%d", &n, &m);
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	137 ms	35832 KB	Output is correct
2	Correct	131 ms	35836 KB	Output is correct
3	Correct	134 ms	35836 KB	Output is correct
4	Correct	136 ms	35836 KB	Output is correct
5	Correct	138 ms	35840 KB	Output is correct
6	Correct	134 ms	36012 KB	Output is correct
7	Correct	134 ms	36012 KB	Output is correct
8	Correct	135 ms	36012 KB	Output is correct
9	Correct	134 ms	36072 KB	Output is correct
10	Correct	130 ms	36076 KB	Output is correct
11	Correct	133 ms	36076 KB	Output is correct
12	Correct	133 ms	36108 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	137 ms	35832 KB	Output is correct
2	Correct	131 ms	35836 KB	Output is correct
3	Correct	134 ms	35836 KB	Output is correct
4	Correct	136 ms	35836 KB	Output is correct
5	Correct	138 ms	35840 KB	Output is correct
6	Correct	134 ms	36012 KB	Output is correct
7	Correct	134 ms	36012 KB	Output is correct
8	Correct	135 ms	36012 KB	Output is correct
9	Correct	134 ms	36072 KB	Output is correct
10	Correct	130 ms	36076 KB	Output is correct
11	Correct	133 ms	36076 KB	Output is correct
12	Correct	133 ms	36108 KB	Output is correct
13	Correct	131 ms	36132 KB	Output is correct
14	Correct	137 ms	36132 KB	Output is correct
15	Correct	134 ms	36132 KB	Output is correct
16	Correct	133 ms	36164 KB	Output is correct
17	Correct	130 ms	36164 KB	Output is correct
18	Correct	131 ms	36164 KB	Output is correct
19	Correct	130 ms	36164 KB	Output is correct
20	Correct	132 ms	36164 KB	Output is correct
21	Correct	132 ms	36224 KB	Output is correct
22	Correct	129 ms	36224 KB	Output is correct
23	Correct	131 ms	36224 KB	Output is correct
24	Correct	130 ms	36224 KB	Output is correct
25	Correct	130 ms	36224 KB	Output is correct
26	Correct	141 ms	36224 KB	Output is correct
27	Correct	132 ms	36224 KB	Output is correct