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Submission #237851

# Submission time Handle Problem Language Result Execution time Memory
237851 2020-06-09T04:32:24 Z sahil_k Tents (JOI18_tents) C++14
0 / 100
 5 ms 384 KB 
#include <iostream>
#define MOD 1000000007
using namespace std;
long long dp_ind[3001][3001];
long long dp_ttl[3001][3001];
int main () {
	int n, m;
	cin >> n >> m;
	for (int i=1; i<=n; i++) {
		for (int j=1; j<=m; j++) {
			dp_ind[i][j] = (4ll*(dp_ttl[i-1][j-1]+1))%MOD;
			dp_ind[i][j] += (1ll*(dp_ttl[max(0, i-2)][j-1]+(i>1?1:0))*(i-1)+(dp_ttl[i-1][max(0, j-2)]+(j>1?1:0))*(j-1))%MOD;
			dp_ttl[i][j] = (1ll*dp_ttl[i-1][j]+dp_ttl[i][j-1]-dp_ttl[i-1][j-1]+dp_ind[i][j]+MOD)%MOD;
		}
	}
	cout << dp_ttl[n][m] << endl;
}

Subtask #1
0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 4 ms 384 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 4 ms 384 KB Output isn't correct
3 Halted 0 ms 0 KB -