**Valid Parentheses LeetCode Problem | LeetCode Problems For Beginners | LeetCode Problems & Solutions | Improve Problem Solving Skills | LeetCode Problems Java | LeetCode Problems C++**

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In this post, you will find the solution for the **Valid Parentheses in C++, Java & Python-LeetCode problem**. We are providing the **correct and tested solutions** to coding problems present on **LeetCode**. If you are not able to solve any problem, then you can take help from our Blog/website.

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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 <= 10`

^{4}`s`

consists of parentheses only`'()[]{}'`

.

Valid Parentheses– LeetCode Solutions

class Solution { public: bool isValid(string s) { stackstack; 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 & stack) { const int c = stack.top(); stack.pop(); return c; } };

class Solution { public boolean isValid(String s) { Stackstack = 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