problem1 link 枚举每一种大于等于$n$的计算其概率即可. problem2 link 首先二分答案,然后计算.令$f[i][j]$表示移动完前$i$最后一个在位置$j$的最小代价. problem3 link 假如一个数质因子分解为$n=p_{1}^{x_{1}}p_{2}^{x_{2}}..p_{t}^{x_{t}}$,那么其约数的个数为$(x_{1}+1)(x_{2}+1)..(x_{t}+1)$ 所以只需要将$k$分解成若干数字之积,然后分配每个约数最小的一些质数即可. 令$…
problem1 link 倒着想.每次添加一个右括号再添加一个左括号,直到还原.那么每次的右括号的选择范围为当前左括号后面的右括号减去后面已经使用的右括号. problem2 link 令$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…
