Rikka with Parenthesis II Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 857    Accepted Submission(s): 442 Problem Description As we know, Rikka is poor at math. Yuta is worrying about this si…

BUPT2017 wintertraining(16) #4 G HDU - 5831 题意 给定括号序列,问能否交换一对括号使得括号合法. 题解 注意()是No的情况. 任意时刻)不能比(超过2个以上. 最后)和(的差距要在两个以内,且n必须是偶数. 代码 #include <cstdio> #include <cstring> #include <algorithm> #include <iostream> using namespace std; ch…