add 3168

Author: fishercoder1534

paginated_contents/algorithms/4th_thousand/README.md

@@ -32,6 +32,7 @@
 | 3175 | [Find The First Player to win K Games in a Row](https://leetcode.com/problems/find-the-first-player-to-win-k-games-in-a-row/)                                       | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3175.java) |                                                                               | Medium     |
 | 3174 | [Clear Digits](https://leetcode.com/problems/clear-digits/)                                                                                                         | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3174.java) |                                                                               | Easy       |
 | 3173 | [Bitwise OR of Adjacent Elements](https://leetcode.com/problems/bitwise-or-of-adjacent-elements/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3173.java) |                                                                               | Easy       |
+| 3168 | [Minimum Number of Chairs in a Waiting Room](https://leetcode.com/problems/minimum-number-of-chairs-in-a-waiting-room/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3168.java) |                                                                               | Easy       |
 | 3164 | [Find the Number of Good Pairs II](https://leetcode.com/problems/find-the-number-of-good-pairs-ii/)                                                                 | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3164.java) |                                                                               | Medium     |
 | 3162 | [Find the Number of Good Pairs I](https://leetcode.com/problems/find-the-number-of-good-pairs-i/)                                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3162.java) |                                                                               | Easy       |
 | 3157 | [Find the Level of Tree with Minimum Sum](https://leetcode.com/problems/find-the-level-of-tree-with-minimum-sum/)                                                   | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/fourththousand/_3157.java) |                                                                               | Medium     |BFS

src/main/java/com/fishercoder/solutions/fourththousand/_3168.java

@@ -0,0 +1,19 @@
+package com.fishercoder.solutions.fourththousand;
+
+public class _3168 {
+    public static class Solution1 {
+        public int minimumChairs(String s) {
+            int seated = 0;
+            int seats = 0;
+            for (char c : s.toCharArray()) {
+                if (c == 'E') {
+                    seated++;
+                } else {
+                    seated--;
+                }
+                seats = Math.max(seated, seats);
+            }
+            return seats;
+        }
+    }
+}