摘要:
题目如下: Three stones are on a number line at positions a, b, and c. Each turn, you pick up a stone at an endpoint (ie., either the lowest or highest pos 阅读全文
摘要:
题目如下: On an infinite plane, a robot initially stands at (0, 0) and faces north. The robot can receive one of three instructions: "G": go straight 1 un 阅读全文