#include<bits/stdc++.h>
using namespace std;
const int N = 100005;
int n, q, P[N];
string S[N], R[N];
vector < int > vec[N * 2];
bool CMP(int i, int j)
{
return (R[i] < R[j]);
}
inline int Get(int l, int r, int le, int ri)
{
int ret = 0;
l += n; r += n;
for (; l < r; l >>= 1, r >>= 1)
{
if (l & 1) ret += upper_bound(vec[l].begin(), vec[l].end(), ri) - lower_bound(vec[l].begin(), vec[l].end(), le), l ++;
if (r & 1) r --, ret += upper_bound(vec[r].begin(), vec[r].end(), ri) - lower_bound(vec[r].begin(), vec[r].end(), le);
}
return (ret);
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> q;
for (int i = 0; i < n; i ++)
cin >> S[i], P[i] = i;
sort(S, S + n);
for (int i = 0; i < n; i ++)
R[i] = S[i], reverse(R[i].begin(), R[i].end());
sort(P, P + n, CMP);
for (int i = 0; i < n; i ++)
for (int id = i + n; id; id >>= 1)
vec[id].push_back(P[i]);
for (int i = 0; i < n + n; i ++)
sort(vec[i].begin(), vec[i].end());
for (int i = 0; i < q; i ++)
{
string A, B;
cin >> A >> B;
int l = lower_bound(S, S + n, A) - S;
A.back() ++;
int r = lower_bound(S, S + n, A) - S;
reverse(B.begin(), B.end());
R[n] = B;
int le = lower_bound(P, P + n, n, CMP) - P;
B.back() ++; R[n] = B;
int ri = lower_bound(P, P + n, n, CMP) - P;
printf("%d\n", Get(le, ri, l, r));
}
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
11 ms |
11264 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
31 ms |
17776 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
108 ms |
18116 KB |
Output is correct |
2 |
Incorrect |
79 ms |
15224 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
11 ms |
11264 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |