04 2019 档案

Codeforces Round #553 F Sonya and Informatics
摘要："题目" 题目大意 给定一个长为 n（2≤n≤100）的01串 S 。对 S 进行 k（1≤k≤109）次操作：等概率地选取两个下标 i,j（$1 \le i 阅读全文
posted @ 2019-04-19 03:26 Pat 阅读(326) 评论(0) 推荐(0) 编辑
shared_ptr 的循环依赖问题
摘要：```c++ include include using namespace std; struct A; struct B; struct A { shared_ptr B_ptr; A() { cout A_ptr; B() { cout ap(new A()); // ap 的引用计数是1 s 阅读全文
posted @ 2019-04-08 23:41 Pat 阅读(687) 评论(2) 推荐(0) 编辑
【C++ 拾遗】extern 关键字
摘要：Separate compilation let us split our programs into several files, each of which can be compiled independently. allows programs to be written in logic 阅读全文
posted @ 2019-04-08 23:37 Pat 阅读(337) 评论(0) 推荐(0) 编辑

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