Merge pull request ignacio-chiazzo#29 from ignacio-chiazzo/prob

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/ |