Leetcode#20||Valid Parentheses
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public class Solution { public boolean isValid(String s) { Map<Character, Character> map = new HashMap<Character, Character>(); map.put('(', ')'); map.put('[', ']'); map.put('{', '}'); Stack<Character> stack = new Stack<Character>(); for (int i = 0; i < s.length(); i++) { char c = s.charAt(i); if (map.keySet().contains(c)) { stack.push(c); } else if (map.values().contains(c)) { if (!stack.isEmpty() && map.get(stack.peek()) == c) { stack.pop(); } else { return false; } } } return stack.isEmpty(); }} 0 0
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