problem1 link 分类讨论.高度没有太大关系.主要看长度. problem2 link 二分答案$mid$.计算每种$card$不足的部分,加起来,小于等于$min(jokers,mid)$就是合法的. problem3 link 为了方便说明,以下所说的$x,y,a$分别是菱形宽度一半的平方.高度一半的平方.边长的平方.所以有$x+y=a$ 对于宽的来说,比如第一个,$y_{1}\leq x_{1}$,所以$0\leq y_{1}\leq \frac{a_{1}}{2}$ 对于高的来…
problem1 link 倒着想.每次添加一个右括号再添加一个左括号,直到还原.那么每次的右括号的选择范围为当前左括号后面的右括号减去后面已经使用的右括号. problem2 link 令$h(x)=\sum_{i=1}^{x}g(i)$,那么答案为$h(R)-h(L-1)$.对于$h(x)$: (1)如果$x\leq K$,那么$h(x)=0$ (2)否则对于$[K+1,x]$之间的所有偶数来说,对答案的贡献为$even+h(\frac{x}{2})-h(\frac{K}{2})$,其中$e…
Problem Statement You are given the ints perimeter and area. Your task is to find a triangle with the following properties: The coordinates of each vertex are integers between 0 and 3000, inclusive. The perimeter of the triangle must be exactly…
Problem Statement The Happy Letter game is played as follows: At the beginning, several players enter the field. Each player has a lowercase English letter on their back. The game is played in turns. In each turn, you select two players with dif…
