You want to perform the combo on your opponent in one popular fighting game. The combo is the string ss consisting of nn lowercase Latin letters. To perform the...

You are given two positive integers aa and bb.

You are given the array aa consisting of nn elements and the integer k≤nk≤n.

The organizers of a programming contest have decided to present t-shirts to participants. There are six different t-shirts sizes in this problem: S, M, L, XL, X...

You have array of nn numbers a1,a2,…,ana1,a2,…,an.

You have an array aa of length nn. For every positive integer xx you are going to perform the following operation during the xx-th second:

You have integer nn. Calculate how many ways are there to fully cover belt-like area of 4n−24n−2 triangles with diamond shapes.

You have unweighted tree of nn vertices. You have to assign a positive weight to each edge so that the following condition would hold:

You have a large electronic screen which can display up to 998244353998244353 decimal digits. The digits are displayed in the same way as on different electroni...

Today, Yasser and Adel are at the shop buying cupcakes. There are nn cupcake types, arranged from 11 to nn on the shelf, and there are infinitely many of each t...