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 (char h : s){if (stk.empty() || h == '(' || h == '{' || h == '['){stk.push(h);}else{if (h == ')'&&stk.top() == '('){stk.pop();}else if (h == '}'&&stk.top() == '{'){stk.pop();}else if (h == ']'&&stk.top() == '['){stk.pop();}else{stk.push(h);}}}return stk.empty();}}; 0 0
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