Category: implementation

Base62, like Base10 (decimal), Base16 (hexadecimal), is a number system. Base62 uses 62 possible ASCII letters, 0 – 9, a – z and A – Z, therefore it is often …

The problem is from codeforces: http://www.codeforces.com/problemset/problem/260/A This problem looks difficult at the first glance because of the input ranges are large for the given three integers. Using bruteforce to print …

PHP Provides str_rot13 function to rotate alphabetic characters by 13 places. However, there is no str_rot47 function to rotate 47 places over a larger mapping table. The following is …

The problem is from codeforces: http://www.codeforces.com/problemset/problem/245/E The minimal number of people can be obtained by greedy approach, assuming that at each possible cases, the same people entered and left …

In , the GCD (Greatest Common Divisor) is given in brief details. The algorithm can be implemented in both recursive and iterative forms. The recursive formula is , and …