题意：求覆盖平面nnn个点的最小半径圆。思路：Welzl’s算法：最直接的方法就是模拟退火，不过这里不用。这里用的是Welzl’s算法求最小覆盖圆，期望复杂度为O(n)O(n)O(n)。基于的结论是：只要得出了覆盖前iii个点的最小覆盖圆，那么第i+1i+1i+1个点如果在圆外，那么第i+1i+1i+1个点就应该在圆上，因此可以根据第i+1i+1i+1个点与圆的位置，迭代的更新圆上的三个点（或两个

The development of a text editor is a hard problem. You need to implement an extra module for brackets coloring in text.Your editor consists of a line with infinite length and cursor, which points to.

题意：弄两个多边形覆盖图中所有点，要求里面多边形面积比上外面多边形面积值最大。思路：枚举用的是哪个多边形，则比值最大时，外面那个多边形覆盖所有点，里面那个多边形一个点都没有覆盖。二分就好了。#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#include &

Uncle Bogdan is in captain Flint’s crew for a long time and sometimes gets nostalgic for his homeland. Today he told you how his country introduced a happiness index.There are ???? cities and ????−1 u