24581번 - Even Substrings 다국어

문제

You are given a string s[1..n] consisting of the first 6 lowercase English letters between a and f. A substring is called even if every distinct letter in it appears an even number of times. For example, in abbacac there are 4 even substrings: abba, bb, acac, bbacac. If a same substring appears at different locations, they shall be counted multiple times, e.g. the string aaa has 2 even substrings aa.

You are to process q queries of the following two types:

1. Given a range specified by two integers l and r, count the number of even substrings in s[l..r], the substring of s starting at s[l] and ending at s[r] (both ends are inclusive).
2. Given an index i and a letter x between a and f, change s[i] to x.

입력

The first line of input has a single string s[1..n] (1 ≤ n ≤ 2 · 10⁵) consisting of letters between a and f.

The second line of input has a single integer q (1 ≤ q ≤ 2 · 10⁵), the number of queries. Each of the next q lines gives one query:

• Type 1 query has 1 l r (1 ≤ l ≤ r ≤ n).
• Type 2 query has 2 i x (1 ≤ i ≤ n), where x is a letter between a and f.

There is at least one query of type 1.

출력

For each type 1 query output the number of even substrings on a single line.

제한

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