摘要："A. K th Symbol in Grammar" Description On the first row, we write a 0. Now in every subsequent row, we look at the previous row and replace each occu 阅读全文

摘要："A. Scarborough Fair" 题意 对给定的长度为$n$的字符串进行$m$次操作，每次将一段区间内的某一个字符替换成另一个字符。 思路 直接模拟 Code include using namespace std; typedef long long LL; int main() { i 阅读全文