摘要:
Problem Description Chiaki has n strings s1,s2,…,sn consisting of '(' and ')'. A string of this type is said to be balanced:+ if it is the empty strin 阅读全文
摘要:
Problem Description Chiaki has an array of n positive integers. You are told some facts about the array: for every two elements ai and aj in the subar 阅读全文