LeetCode 20. Valid Parentheses
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public class Solution { public boolean isValid(String s) { Stack<Character> stack = new Stack<Character>(); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (c == '(') stack.push(')'); else if (c == '[') stack.push(']'); else if (c == '{') stack.push('}'); else if (stack.isEmpty() || c != stack.pop()) return false; } if (stack.isEmpty()) return true; else return false; }} 0 0
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