remove invalid par

Author: ignacio-chiazzo

LeetcodeProblems/Remove_Invalid_Parentheses.js

@@ -0,0 +1,79 @@
+/*
+Remove Invalid Parentheses
+https://leetcode.com/problems/remove-invalid-parentheses/
+
+Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.
+
+Note: The input string may contain letters other than the parentheses ( and ).
+
+Example 1:
+
+Input: "()())()"
+Output: ["()()()", "(())()"]
+Example 2:
+
+Input: "(a)())()"
+Output: ["(a)()()", "(a())()"]
+Example 3:
+
+Input: ")("
+Output: [""]
+*/
+
+/**
+ * @param {string} s
+ * @return {string[]}
+ */
+var removeInvalidParentheses = function(s) {
+ var queue = [];
+ var visited = new Set();
+ queue.push(s);
+ var result = [];
+ var found = false;
+ 
+ while(queue.length !== 0) {
+ var str = queue.shift();
+ if(isValid(str)) {
+ result.push(str);
+ found = true;
+ } else if(!found){ 
+ for(var i = 0; i < s.length; i++) {
+ if(str[i] === "(" || str[i] === ")") {
+ var subStr = str.slice(0, i) + str.slice(i + 1, s.length);
+ if(!visited.has(subStr)) {
+ queue.push(subStr); 
+ visited.add(subStr);
+ }
+ } 
+ }
+ }
+ }
+ 
+ return result;
+};
+
+var isValid = function(s) {
+ var leftCount = 0;
+ var iter = 0;
+ while(iter < s.length) {
+ if(s[iter] === "(") 
+ leftCount++;
+ else if(s[iter] === ")") {
+ leftCount--;
+ if(leftCount < 0)
+ return false;
+ }
+ iter++;
+ } 
+ 
+ return leftCount === 0;
+}
+
+var main = function() {
+ console.log(removeInvalidParentheses("))))(()"));
+ console.log(removeInvalidParentheses("(()"));
+ console.log(removeInvalidParentheses("(d))()"));
+ console.log(removeInvalidParentheses("(())"))
+}
+
+module.exports.main = main;

README.md

@@ -7,6 +7,7 @@ Solutions of algorithm problems using Javascript
 | Name | Level | Link | 
 | - | - | - |
 | [Edit Distance ](/LeetcodeProblems/Edit_Distance.js) | Hard | https://leetcode.com/problems/edit-distance/ |
+| [Remove Invalid Parentheses ](/LeetcodeProblems/Remove_Invalid_Parentheses.js) | Hard | https://leetcode.com/problems/remove-invalid-parentheses/ |
 | [Longest Consecutive Sequence ](/LeetcodeProblems/Longest_Consecutive_Sequence.js) | Hard | https://leetcode.com/problems/longest-consecutive-sequence/ |
 | [Minimum Window Substring ](/LeetcodeProblems/Minimum_Window_Substring.js) | Hard | https://leetcode.com/problems/minimum-window-substring/ |
 | [Regular Expression Matching ](/LeetcodeProblems/Regular_Expression_Matching.js) | Hard | https://leetcode.com/problems/regular-expression-matching/ |