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Submission #362506

# Submission time Handle Problem Language Result Execution time Memory
362506 2021-02-03T12:44:22 Z denkendoemeer Skyscraper (JOI16_skyscraper) C++14
100 / 100
 234 ms 260652 KB 
#include<bits/stdc++.h>
#define ll long long
#define mod 1000000007
using namespace std;
int v[105],n,l;
ll dp[105][105][1005][3];
ll calc(int i,int j,int k,int nr)
{
    if (i && (j<=0 || nr>2))
        return 0;
    ll &ans=dp[i][j][k][nr];
    if (ans!=-1)
        return ans;
    if (i==n)
        return (j==1 && nr==2);
    int aux=(v[i+1]-v[i])*(2*j-nr)+k;
    if (aux>l)
        return 0;
    ans=(2*j-nr)*calc(i+1,j,aux,nr)%mod;
    ans=(ans+(2-nr)*calc(i+1,j+1,aux,nr+1))%mod;
    ans=(ans+(2-nr)*calc(i+1,j,aux,nr+1))%mod;
    ans=(ans+(j+1-nr)*calc(i+1,j+1,aux,nr))%mod;
    ans=(ans+(j-1)*calc(i+1,j-1,aux,nr))%mod;
    return ans;
}
int main()
{
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    int i;
    scanf("%d%d",&n,&l);
    for(i=1;i<=n;i++)
        scanf("%d",&v[i]);
    sort(v+1,v+n+1);
    v[0]=v[1];
    memset(dp,-1,sizeof(dp));
    if (n==1){
        printf("1\n");
    }
    else
        printf("%lld\n",calc(0,0,0,0));
return 0;
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:31:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |     scanf("%d%d",&n,&l);
      |     ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:33:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |         scanf("%d",&v[i]);
      |         ~~~~~^~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 260460 KB Output is correct
2 Correct 134 ms 260460 KB Output is correct
3 Correct 149 ms 260460 KB Output is correct
4 Correct 135 ms 260460 KB Output is correct
5 Correct 136 ms 260460 KB Output is correct
6 Correct 138 ms 260524 KB Output is correct
7 Correct 138 ms 260460 KB Output is correct
8 Correct 138 ms 260480 KB Output is correct
9 Correct 135 ms 260500 KB Output is correct
10 Correct 144 ms 260588 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 133 ms 260460 KB Output is correct
2 Correct 138 ms 260460 KB Output is correct
3 Correct 136 ms 260460 KB Output is correct
4 Correct 135 ms 260460 KB Output is correct
5 Correct 134 ms 260588 KB Output is correct
6 Correct 135 ms 260588 KB Output is correct
7 Correct 137 ms 260460 KB Output is correct
8 Correct 135 ms 260460 KB Output is correct
9 Correct 137 ms 260460 KB Output is correct
10 Correct 136 ms 260588 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 260460 KB Output is correct
2 Correct 134 ms 260460 KB Output is correct
3 Correct 149 ms 260460 KB Output is correct
4 Correct 135 ms 260460 KB Output is correct
5 Correct 136 ms 260460 KB Output is correct
6 Correct 138 ms 260524 KB Output is correct
7 Correct 138 ms 260460 KB Output is correct
8 Correct 138 ms 260480 KB Output is correct
9 Correct 135 ms 260500 KB Output is correct
10 Correct 144 ms 260588 KB Output is correct
11 Correct 133 ms 260460 KB Output is correct
12 Correct 138 ms 260460 KB Output is correct
13 Correct 136 ms 260460 KB Output is correct
14 Correct 135 ms 260460 KB Output is correct
15 Correct 134 ms 260588 KB Output is correct
16 Correct 135 ms 260588 KB Output is correct
17 Correct 137 ms 260460 KB Output is correct
18 Correct 135 ms 260460 KB Output is correct
19 Correct 137 ms 260460 KB Output is correct
20 Correct 136 ms 260588 KB Output is correct
21 Correct 138 ms 260608 KB Output is correct
22 Correct 234 ms 260652 KB Output is correct
23 Correct 199 ms 260460 KB Output is correct
24 Correct 205 ms 260632 KB Output is correct
25 Correct 203 ms 260460 KB Output is correct
26 Correct 189 ms 260460 KB Output is correct
27 Correct 160 ms 260460 KB Output is correct
28 Correct 169 ms 260460 KB Output is correct
29 Correct 213 ms 260632 KB Output is correct
30 Correct 211 ms 260460 KB Output is correct