摘要：
Triangle CountingYou are given n rods oflength 1, 2…,n. You have to pick any 3 of them & build a triangle. How many distincttriangles ... 阅读全文
摘要：
ChessQueen You probably know how the game of chess isplayed and how chess queen operates. Two chess queens are in attacking positionwh... 阅读全文