#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int mxN=100, mxM=1e3, M=1e9+7;
int n, m, a[mxN];
ll dp[mxN][4][mxN+1][mxM+1], ans;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m;
if(n<2) {
cout << 1;
return 0;
}
for(int i=0; i<n; ++i)
cin >> a[i];
sort(a, a+n);
dp[0][0][1][0]=1;
dp[0][1][1][0]=2;
for(int i=0; i+1<n; ++i) {
for(int j=0; j<3; ++j) {
for(int k=1; k<n; ++k) {
for(int l=0; l<=m; ++l) {
int nl=l+(2*k-j)*(a[i+1]-a[i]);
if(nl>m)
break;
dp[i][j][k][l]%=M;
dp[i+1][j][k+1][nl]+=dp[i][j][k][l];
dp[i+1][j+1][k+1][nl]+=(2-j)*dp[i][j][k][l];
dp[i+1][j][k][nl]+=(2*k-j)*dp[i][j][k][l];
dp[i+1][j+1][k][nl]+=(2-j)*(k-j)*dp[i][j][k][l];
dp[i+1][j][k-1][nl]+=(k-j)*(k-1)*dp[i][j][k][l];
if(i+2==n&&(j==1&&k==1||j==2&&k==2))
ans+=dp[i][j][k][l];
}
}
}
}
cout << ans%M;
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:37:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
if(i+2==n&&(j==1&&k==1||j==2&&k==2))
~~~~^~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
384 KB |
Output is correct |
| 3 |
Correct |
2 ms |
512 KB |
Output is correct |
| 4 |
Correct |
3 ms |
896 KB |
Output is correct |
| 5 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1920 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1408 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1664 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2304 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1664 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
3072 KB |
Output is correct |
| 2 |
Correct |
4 ms |
3456 KB |
Output is correct |
| 3 |
Correct |
5 ms |
3840 KB |
Output is correct |
| 4 |
Correct |
4 ms |
3328 KB |
Output is correct |
| 5 |
Correct |
4 ms |
3456 KB |
Output is correct |
| 6 |
Correct |
5 ms |
3840 KB |
Output is correct |
| 7 |
Correct |
4 ms |
2944 KB |
Output is correct |
| 8 |
Correct |
4 ms |
3840 KB |
Output is correct |
| 9 |
Correct |
5 ms |
4096 KB |
Output is correct |
| 10 |
Correct |
5 ms |
3456 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
1 ms |
384 KB |
Output is correct |
| 3 |
Correct |
2 ms |
512 KB |
Output is correct |
| 4 |
Correct |
3 ms |
896 KB |
Output is correct |
| 5 |
Correct |
4 ms |
1792 KB |
Output is correct |
| 6 |
Correct |
4 ms |
1920 KB |
Output is correct |
| 7 |
Correct |
3 ms |
1408 KB |
Output is correct |
| 8 |
Correct |
3 ms |
1664 KB |
Output is correct |
| 9 |
Correct |
4 ms |
2304 KB |
Output is correct |
| 10 |
Correct |
3 ms |
1664 KB |
Output is correct |
| 11 |
Correct |
4 ms |
3072 KB |
Output is correct |
| 12 |
Correct |
4 ms |
3456 KB |
Output is correct |
| 13 |
Correct |
5 ms |
3840 KB |
Output is correct |
| 14 |
Correct |
4 ms |
3328 KB |
Output is correct |
| 15 |
Correct |
4 ms |
3456 KB |
Output is correct |
| 16 |
Correct |
5 ms |
3840 KB |
Output is correct |
| 17 |
Correct |
4 ms |
2944 KB |
Output is correct |
| 18 |
Correct |
4 ms |
3840 KB |
Output is correct |
| 19 |
Correct |
5 ms |
4096 KB |
Output is correct |
| 20 |
Correct |
5 ms |
3456 KB |
Output is correct |
| 21 |
Correct |
12 ms |
15112 KB |
Output is correct |
| 22 |
Correct |
211 ms |
193212 KB |
Output is correct |
| 23 |
Correct |
247 ms |
237436 KB |
Output is correct |
| 24 |
Correct |
265 ms |
271996 KB |
Output is correct |
| 25 |
Correct |
250 ms |
237944 KB |
Output is correct |
| 26 |
Correct |
251 ms |
243960 KB |
Output is correct |
| 27 |
Correct |
199 ms |
229880 KB |
Output is correct |
| 28 |
Correct |
223 ms |
247544 KB |
Output is correct |
| 29 |
Correct |
290 ms |
297208 KB |
Output is correct |
| 30 |
Correct |
315 ms |
237948 KB |
Output is correct |
