Tag: algorithm
The problem is from codeforces: http://www.codeforces.com/problemset/problem/1/B The implementation may not be so easy without Regual Expressions. The core idea is to provide conversion between base 10 and base 26. For …
The problem is from codeforces: http://www.codeforces.com/problemset/problem/239/A It is a simple math problem: finding the numbers x that satisify where y, k, and n are given;
Algorithm complexity can be represented by Big O notation, for example, the following piece of code has complexity that sums up the array. s = 0 arr = for …
The polygons can be regular or irregular. For example, The following idea is the easiest way to compute its area (signed) for any given simple 2-D polygons, even for …
The problem is from codeforces: http://www.codeforces.com/problemset/problem/236/A This simple problem can be solved easily. I use C# to practice the use of Hashset. Bruteforce O(n) each character and count the …
