PAT(Advanced Level) 1140 Look-and-say Sequence (20 分)
题目描述Look-and-saysequenceisasequenceofintegersasthefollowing:D,D1,D111,D113,D11231,D112213111,…whereDisin[0,9]except1.The(n+1)stnumberisakindofdescriptionofthenthnumber.Forexample,the2ndnumbermeansthat