摘要：
给出一个有n个元素的数组，有以下两种操作：Q x y，求出区间[x,y)内不同元素的个数， M x y，把第x个元素的值修改为y。注意题目中的下标是从0开始的 这题超级超级坑 妈的一个水题找了几个小时的BUG 这样AC 这样WA 吃一堑长一智 妈的毒瘤啊 1 #include <bits/stdc+ 阅读全文
摘要：
Given a sequence of n numbers a1, a2, ..., an and a number of d-queries. A d-query is a pair (i, j) (1 ≤ i ≤ j ≤ n). For each d-query (i, j), you have 阅读全文
摘要：
E. XOR and Favorite Number time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output E. XOR and Fa 阅读全文
摘要：
You come home and fell some unpleasant smell. Where is it coming from? You are given an array a. You have to answer the following queries: The Mex of 阅读全文