摘要：
http://www.lydsy.com/JudgeOnline/problem.php?id=2194题意：求$c[k]=\sum_{kusing namespace std;struct cp { double x, y; cp(double _x=0, double _y=0):x(_x),y... 阅读全文
摘要：
http://www.lydsy.com/JudgeOnline/problem.php?id=2157题解：裸lct不解释..#include using namespace std;struct node *null;struct node { node *c[2], *f; bool flag... 阅读全文