Codility-Lessson13-Fibonacci-numbers

100% score soluitions for tasks from Codility lesson 13 "Fibonacci numbers"
13_1.py - Ladder - https://app.codility.com/demo/results/training6QCPKW-AFK/
13_2.py - FibFrog - https://app.codility.com/demo/results/training6QCPKW-AFK/
13_2slow.py - original idea for solving FibFrog. It have different algorithm that is correct, but to slow and failign most of perfomance tests. Code is far from well-written, though i give up working on it when i realized that there is speed issue. - https://app.codility.com/demo/results/training84HFK9-SCB/