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Link for the Problem – Valid Parentheses– LeetCode Problem
Valid Parentheses– LeetCode Problem
Problem:
Given a string s
containing just the characters '('
, ')'
, '{'
, '}'
, '['
and ']'
, determine if the input string is valid.
An input string is valid if:
- Open brackets must be closed by the same type of brackets.
- Open brackets must be closed in the correct order.
Example 1:
Input: s = "()" Output: true
Example 2:
Input: s = "()[]{}" Output: true
Example 3:
Input: s = "(]" Output: false
Constraints:
1 <= s.length <= 104
s
consists of parentheses only'()[]{}'
.
Valid Parentheses– LeetCode Solutions
class Solution { public: bool isValid(string s) { stack<char> stack; for (const char c : s) if (c == '(') stack.push(')'); else if (c == '{') stack.push('}'); else if (c == '[') stack.push(']'); else if (stack.empty() || pop(stack) != c) return false; return stack.empty(); } private: int pop(stack<char>& stack) { const int c = stack.top(); stack.pop(); return c; } };
class Solution { public boolean isValid(String s) { Stack<Character> stack = new Stack<>(); for (final char c : s.toCharArray()) if (c == '(') stack.push(')'); else if (c == '{') stack.push('}'); else if (c == '[') stack.push(']'); else if (stack.isEmpty() || stack.pop() != c) return false; return stack.isEmpty(); } }
class Solution: def isValid(self, s: str) -> bool: stack = [] for c in s: if c == '(': stack.append(')') elif c == '{': stack.append('}') elif c == '[': stack.append(']') elif not stack or stack.pop() != c: return False return not stack
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