[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> stk; for (auto c : s) { if (c == '(' || c == '{' || c == '[') stk.push(c); else { if (stk.empty() || (stk.top() != c - 1 && stk.top() != c - 2)) return false; stk.pop(); } } return stk.empty(); }};
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