摘要:
You are given two strings 𝑠s and 𝑡t, both consisting of lowercase English letters. You are going to type the string 𝑠s character by character, from 阅读全文
摘要:
A. Div. 7 给一个数,问最少修改多少位可以让这个数被7整除。 注意到7小于10,因此每10个数必然有一个7,所以最多只需要修改一次个位即可。 #include <iostream> #include <cmath> #define ll long long using namespace s 阅读全文
摘要:
Mihai has just learned about the MEX concept and since he liked it so much, he decided to use it right away. Given an array 𝑎a of 𝑛n non-negative in 阅读全文