包含一些大眾化的數學題目，比如說buffon丟針問題、dijkstra的三色旗問題、找零錢問題、背包問題、無限位數的整數運算、最短路徑問題-Contains a number of popular topics in mathematics, for example, lost buffon needle problem, dijkstra the tri-color flag in trouble, go to change the problem, knapsack problem, inf