Proof without Words
Hint: Considering adding the gray triangles … Hint: Considering adding the gray rectangles … –EOF (The Ultimate Computing & Technology Blog) — 76 words The Permanent URL is: Proof …
Null Reference Exception due to Null String in C#
Unlike Delphi, the string in C# is type of object. Therefore, you can reference the Length property to obtain the length of the string. However, when null value is …
Codeforces: 239A. Two Bags of Potatoes
November 7, 2012
algorithms, beginner, brute force, codeforces, greedy algorithm, implementation, java, programming languages, python
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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
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 …
Sign Area of Irregular Polygon
October 31, 2012
algorithms, beginner, c #, geometry, implementation, math, programming languages, tricks
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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 …
Codeforces: 236A. Boy or Girl ?
October 29, 2012
algorithms, brute force, c #, codeforces, implementation, programming languages
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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 …