#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int MAXN = 100;
const ll MOD = 1e9+7;
int N, L, A[MAXN+10], S[MAXN+10];
ll dp[110][110][1010][4];
ll solve(int pos, int comp, int val, int state)
{
int t=A[pos]-A[pos-1];
val+=(comp*2-state)*t;
if(val<0) return 0;
if(val>L) return 0;
if(pos==N+1)
{
if(comp==1 && state==2) return 1;
else return 0;
}
ll &ret=dp[pos][comp][val][state];
if(ret!=-1) return ret;
ret=0;
ret+=(comp+1-state)*solve(pos+1, comp+1, val, state);
if(comp>=1) ret+=(comp*2-state)*solve(pos+1, comp, val, state);
if(comp>=2) ret+=(comp-1)*solve(pos+1, comp-1, val, state);
if(state==1)
{
ret+=solve(pos+1, comp, val, state+1);
ret+=solve(pos+1, comp+1, val, state+1);
}
else if(state==0)
{
ret+=2*solve(pos+1, comp, val, state+1);
ret+=2*solve(pos+1, comp+1, val, state+1);
}
ret%=MOD;
//printf("%d %d %d %d : %lld\n", pos, comp, val, state, ret);
return ret;
}
int main()
{
scanf("%d%d", &N, &L);
if(N==1) return !printf("1");
for(int i=1; i<=N; i++) scanf("%d", &A[i]);
sort(A+1, A+N+1);
A[0]=A[1];
memset(dp, -1, sizeof(dp));
printf("%lld\n", solve(1, 0, 0, 0));
//printf("!%d %d\n", v1, v2);
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:52:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
52 | scanf("%d%d", &N, &L);
| ~~~~~^~~~~~~~~~~~~~~~
skyscraper.cpp:54:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
54 | for(int i=1; i<=N; i++) scanf("%d", &A[i]);
| ~~~~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
256 KB |
Output is correct |
| 2 |
Correct |
217 ms |
382968 KB |
Output is correct |
| 3 |
Correct |
219 ms |
382968 KB |
Output is correct |
| 4 |
Correct |
221 ms |
382972 KB |
Output is correct |
| 5 |
Correct |
218 ms |
382968 KB |
Output is correct |
| 6 |
Correct |
218 ms |
382968 KB |
Output is correct |
| 7 |
Correct |
222 ms |
382968 KB |
Output is correct |
| 8 |
Correct |
220 ms |
382968 KB |
Output is correct |
| 9 |
Correct |
214 ms |
382968 KB |
Output is correct |
| 10 |
Correct |
219 ms |
382968 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
217 ms |
382968 KB |
Output is correct |
| 2 |
Correct |
219 ms |
383096 KB |
Output is correct |
| 3 |
Correct |
221 ms |
383008 KB |
Output is correct |
| 4 |
Correct |
219 ms |
382968 KB |
Output is correct |
| 5 |
Correct |
217 ms |
383096 KB |
Output is correct |
| 6 |
Correct |
220 ms |
382968 KB |
Output is correct |
| 7 |
Correct |
220 ms |
382968 KB |
Output is correct |
| 8 |
Correct |
220 ms |
383056 KB |
Output is correct |
| 9 |
Correct |
217 ms |
382968 KB |
Output is correct |
| 10 |
Correct |
215 ms |
382968 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
256 KB |
Output is correct |
| 2 |
Correct |
217 ms |
382968 KB |
Output is correct |
| 3 |
Correct |
219 ms |
382968 KB |
Output is correct |
| 4 |
Correct |
221 ms |
382972 KB |
Output is correct |
| 5 |
Correct |
218 ms |
382968 KB |
Output is correct |
| 6 |
Correct |
218 ms |
382968 KB |
Output is correct |
| 7 |
Correct |
222 ms |
382968 KB |
Output is correct |
| 8 |
Correct |
220 ms |
382968 KB |
Output is correct |
| 9 |
Correct |
214 ms |
382968 KB |
Output is correct |
| 10 |
Correct |
219 ms |
382968 KB |
Output is correct |
| 11 |
Correct |
217 ms |
382968 KB |
Output is correct |
| 12 |
Correct |
219 ms |
383096 KB |
Output is correct |
| 13 |
Correct |
221 ms |
383008 KB |
Output is correct |
| 14 |
Correct |
219 ms |
382968 KB |
Output is correct |
| 15 |
Correct |
217 ms |
383096 KB |
Output is correct |
| 16 |
Correct |
220 ms |
382968 KB |
Output is correct |
| 17 |
Correct |
220 ms |
382968 KB |
Output is correct |
| 18 |
Correct |
220 ms |
383056 KB |
Output is correct |
| 19 |
Correct |
217 ms |
382968 KB |
Output is correct |
| 20 |
Correct |
215 ms |
382968 KB |
Output is correct |
| 21 |
Correct |
219 ms |
382968 KB |
Output is correct |
| 22 |
Correct |
409 ms |
383096 KB |
Output is correct |
| 23 |
Correct |
293 ms |
383096 KB |
Output is correct |
| 24 |
Correct |
312 ms |
383096 KB |
Output is correct |
| 25 |
Correct |
303 ms |
383000 KB |
Output is correct |
| 26 |
Correct |
302 ms |
382968 KB |
Output is correct |
| 27 |
Correct |
261 ms |
383116 KB |
Output is correct |
| 28 |
Correct |
273 ms |
383096 KB |
Output is correct |
| 29 |
Correct |
344 ms |
382968 KB |
Output is correct |
| 30 |
Correct |
296 ms |
382968 KB |
Output is correct |
