南阳OJ-2-括号配对问题---栈的应用
题目链接:
http://acm.nyist.edu.cn/JudgeOnline/problem.php?pid=2
题目大意:
有一行括号序列,请你检查这行括号是否配对。
思路:
直接用栈来模拟
1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<algorithm> 5 #include<cmath> 6 #include<queue> 7 #include<stack> 8 #include<map> 9 using namespace std; 10 typedef long long ll; 11 const int maxn = 1e6 + 10; 12 const int INF = 1 << 30; 13 int T, n, m; 14 int main() 15 { 16 cin >> T; 17 while(T--) 18 { 19 string s; 20 cin >> s; 21 bool ok = 1; 22 stack<char>q; 23 for(int i = 0; i < s.size(); i++) 24 { 25 if(s[i] == '[' || s[i] == '(')q.push(s[i]); 26 else 27 { 28 if(q.empty()) 29 { 30 ok = 0; 31 break; 32 } 33 char c = q.top(); 34 //cout<<c<<endl; 35 q.pop(); 36 if(s[i] == ']' && c != '[' || s[i] == ')' && c != '(') 37 { 38 ok = 0; 39 break; 40 } 41 } 42 } 43 if(ok)cout<<"Yes"<<endl; 44 else cout<<"No"<<endl; 45 } 46 return 0; 47 }
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