시간 제한 | 메모리 제한 | 제출 | 정답 | 맞힌 사람 | 정답 비율 |
---|---|---|---|---|---|
14 초 | 512 MB | 1 | 1 | 1 | 100.000% |
A suffix array for string $s$ of length $n$ is a permutation $sa$ of integers from $1$ to $n$ such that $s[sa_1.. n], s[sa_2..n], \dots, s[sa_n..n]$ is the list of non-empty suffixes of $s$ sorted in lexicographical order. The rank table for suffixex of $s$ is a permutation $rank$ of integers from $1$ to $n$ such that $rank_{sa_i} = i$.
Kotori has a string $s=s_1s_2\dots s_n$. She would like to ask $m$ queries. And in the $i$-th query, a substring $x=s[l_i..r_i]$ of $s$ is given, Kotori would like to know the rank of suffix $s[k_i..r_i]$ of $x$.
Note $s[l..r]$ means the substring of $s$ which starts from the $l$-th position and ends at the $r$-th position, both inclusive.
There are multiple test cases. The first line of the input contains an integer $T$ indicating the number of test cases. For each test case:
The first line contains two integers $n$ and $m$ ($1 \le n, m \le 5 \times 10^4$) -- the length of the string and the number of queries.
The second line contains a string $s$ of length $n$ consisting only of lowercase English letters.
Each of the next $m$ lines contains three integers $l_i$, $r_i$ and $k_i$ ($1 \le l_i \le r_i \le n, l_i \le k_i \le r_i$) denoting a query.
It is guaranteed that neither the sum of $n$ or the sum of $m$ of all test cases will exceed $5 \times 10^4$.
For each query output one line containing one integer denoting the answer.
2 10 4 baaabbabba 2 8 3 1 1 1 2 3 2 2 5 4 20 3 cccbccbadaacbbbcccab 14 17 16 3 20 17 17 20 18
2 1 2 3 4 15 3