//#include<fstream>
#include<queue>
#include<iostream>
#include<algorithm>
#define mod 1000000007
#define fin cin
#define fout cout
using namespace std;
//ifstream fin("date.in");
//ofstream fout("date.out");
char c[2010],a,b;
int q,i,j,n,l,s,v[2010][2010],d[2010][26],sol[2010][26][26];
int main()
{
fin>>c;
for(i=0;c[i]!=0;i++);n=i;
for(i=n-1;i>=0;i--) for(j=i+1;j<=n-1;j++) d[i][c[j]-'a']++;
for(i=0;i<=n;i++)
{
v[i][0]=1;
for(j=1;j<=i;j++)
{
v[i][j]=v[i-1][j]+v[i-1][j-1];
if(v[i][j]>=mod) v[i][j]-=mod;
}
}
for(s=2;s<=n;s++)
for(i=0;i<n;i++)
for(j=0;j<='z'-'a';j++)
if(i>=s-2)
{
sol[s][c[i]-'a'][j]+=(v[i][s-2]*d[i][j])%mod;
if(sol[s][c[i]-'a'][j]>=mod) sol[s][c[i]-'a'][j]-=mod;
}
fin>>q;
for(i=1;i<=q;i++)
{
fin>>l;
fin>>a>>b;
fout<<sol[l][a-'a'][b-'a']<<"\n";
}
return 0;
}
Compilation message
mate.cpp: In function 'int main()':
mate.cpp:16:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
for(i=0;c[i]!=0;i++);n=i;
^~~
mate.cpp:16:26: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
for(i=0;c[i]!=0;i++);n=i;
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
89 ms |
888 KB |
Output is correct |
| 2 |
Correct |
60 ms |
760 KB |
Output is correct |
| 3 |
Correct |
70 ms |
1016 KB |
Output is correct |
| 4 |
Incorrect |
117 ms |
1016 KB |
Output isn't correct |
| 5 |
Incorrect |
429 ms |
3552 KB |
Output isn't correct |
| 6 |
Incorrect |
484 ms |
3896 KB |
Output isn't correct |
| 7 |
Incorrect |
368 ms |
3392 KB |
Output isn't correct |
| 8 |
Incorrect |
336 ms |
3192 KB |
Output isn't correct |
| 9 |
Execution timed out |
2041 ms |
27308 KB |
Time limit exceeded |
| 10 |
Execution timed out |
2031 ms |
27868 KB |
Time limit exceeded |
