Problem Given an array equations of strings that represent relationships between variables, each string equations[i] has length 4 and takes one of two different forms: “a==b” or “a!=b”. Here, a and b
题目链接:https://codeforc.es/contest/1451/problem/C Ashish has two strings a and b, each of length n, and an integer k. The strings only contain lowercase English letters. He wants to convert string a i