As we already know, base64 is a common binary-to-text encoding scheme. Here we define a special series of positional systems that represent numbers using a base (a.k.a. radix) of 22 to 6262. The symbo
A A Hard Problem 题意:给定一个正整数 n ,你需要找出最小整数 k,满足:从{1,2,⋯,n}中任意选择长度为k的子集,存在两个不同的整数 u,v∈T, 且 u 是 v 的因数。 思路:打表找规律 #include <bits/stdc++.h>#define ios ios::sync_with_stdio(0),cin.tie(0)#define PII pai