Leetcode 20. Valid Parentheses
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Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid.
The brackets must close in the correct order, “()” and “()[]{}” are all valid but “(]” and “([)]” are not.
class Solution {public: bool isValid(string s) { stack<char> am; for (auto i : s) { if (i == '(' || i == '{' || i == '[') am.push(i); else if (am.empty()) return false; if (i == ')') { if (am.top() == '(') am.pop(); else return false; } if (i == ']') { if (am.top() == '[') am.pop(); else return false; } if (i == '}') { if (am.top() == '{') am.pop(); else return false; } } if (am.empty()) return true; return false; }};阅读全文
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