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AtCoder Regular Contest 149 - A - Repdigit Number - 题解You are given positive integers N and M. Find the maximum positive integer X that satisfies all of the following conditions.X is a positive integer less than 10 N , and all digits in the decimal re

AtCoder Beginner Contest 259 - D - Circumferences - 题解You are given N circles on the xy-coordinate plane. For each i=1,2,…,N, the i-th circle is centered at (x i​ ,y i​ ) and has a radius of r i​ .Determine whether it is possible to get from (s

AtCoder Beginner Contest 259 - C - XX to XXX - 题解You are given two strings S and T. Determine whether it is possible to make S equal T by performing the following operation some number of times (possibly zero).Between two consecutive equal characters in

AtCoder Beginner Contest 259 - B - Counterclockwise Rotation - 题解In an xy-coordinate plane whose x-axis is oriented to the right and whose y-axis is oriented upwards, rotate a point (a,b) around the origin d degrees counterclockwise and find the new coord

AtCoder Beginner Contest 259 - A - Growth Record - 题解Takahashi had his N-th birthday, when he was T centimeters tall.Additionally, we know the following facts:In each year between Takahashi's birth (0-th birthday) and his X-th birthday, his height incr