There are N integers (1<=N<=65537) A1, A2,.. AN (0<=Ai<=10^9). You need to find amount of such pairs (i, j) that 1<=i<j<=N and A[i]>A[j].

Vasya learned definition of median of three numbers. He says, “Median of three numbers is the number located in the middle when numbers are ordered in non-desce...

On a circle border there are 2k different points A1, A2, …, A2k, located contiguously. These points connect k chords so that each of points A1, A2, …, A2k is th...

Fortune-telling with camomileProblem DescriptionMasha loves Petya. The following question gives he

TsPetya is well-known with his famous cabbage patties. Petya’s birthday will come very soon, and he wants to invite as many guests as possible. But the boy want...

BUSY传输只能在未定义长度的burst传输(INCR)结束时发生，不能在固定长度burst传输（SINGLE, INCR4, WRAP4, INCR8, WRAP8, INCR16, WRAP16）的末端发生。

Given a 32-bit signed integer, reverse digits of an integer.

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n.

Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product.