solves latest time by replacing hidden digits

Author: anishLearnsToCode

Diff for: README.md

@@ -425,7 +425,7 @@
 | 1720 | [Decode XORed Array](https://leetcode.com/problems/decode-xored-array)                                                                                    |                                                                [![Java](assets/java.png)](src/DecodeXORedArray.java)                                                                 |                                                                                                                                   |
 | 1725 | [Number Of Rectangles That Can Form The Largest Square](https://leetcode.com/problems/number-of-rectangles-that-can-form-the-largest-square)              |                                                  [![Java](assets/java.png)](src/NumberOfRectanglesThatCanFormTheLargestSquare.java)                                                  |                                                                                                                                   |
 | 1732 | [Find the Highest Altitude](https://leetcode.com/problems/find-the-highest-altitude)                                                                      |                                                             [![Java](assets/java.png)](src/FindTheHighestAltitude.java)                                                              |                                                                                                                                   |
-| 1736 | [Latest Time by Replacing Hidden Digits](https://leetcode.com/problems/latest-time-by-replacing-hidden-digits)                                            |                                                                                                                                                                                      |                                                                                                                                   |
+| 1736 | [Latest Time by Replacing Hidden Digits](https://leetcode.com/problems/latest-time-by-replacing-hidden-digits)                                            |                                                        [![Java](assets/java.png)](src/LatestTimeByReplacingHiddenDigits.java)                                                        |                                                                                                                                   |
 | 1742 | [Maximum Number of Balls in a Box](https://leetcode.com/problems/maximum-number-of-balls-in-a-box)                                                        |                                                                                                                                                                                      |                                                                                                                                   |
 | 1748 | [Sum of Unique Elements](https://leetcode.com/problems/sum-of-unique-elements)                                                                            |                                                                                                                                                                                      |                                                                                                                                   |
 | 1752 | [Check if Array Is Sorted and Rotated](https://leetcode.com/problems/check-if-array-is-sorted-and-rotated)                                                |                                                                                                                                                                                      |                                                                                                                                   |

Diff for: src/LatestTimeByReplacingHiddenDigits.java

@@ -0,0 +1,28 @@
+public class LatestTimeByReplacingHiddenDigits {
+    public String maximumTime(String time) {
+        String[] parts = time.split(":");
+        String hour = parts[0], minutes = parts[1];
+        return new StringBuilder(maxHours(hour)).append(':').append(maxMinutes(minutes)).toString();
+    }
+
+    private String maxHours(String string) {
+        if (string.charAt(0) == '?') {
+            if (string.charAt(1) == '?') return "23";
+            if (string.charAt(1) > '3') return "1" + string.charAt(1);
+            return "2" + string.charAt(1);
+        } else if (string.charAt(1) == '?') {
+            return string.charAt(0) + (string.charAt(0) == '2' ? "3" : "9");
+        }
+        return string;
+    }
+
+    private String maxMinutes(String string) {
+        if (string.charAt(0) == '?') {
+            if (string.charAt(1) == '?') return "59";
+            return "5" + string.charAt(1);
+        } else if (string.charAt(1) == '?') {
+            return string.charAt(0) + "9";
+        }
+        return string;
+    }
+}