solves check if sentence is a pangram

Author: anishLearnsToCode

README.md

@@ -445,7 +445,7 @@
 | 1822 | [Sign of the Product of an Array](https://leetcode.com/problems/sign-of-the-product-of-an-array)                                                          |                                                            [![Java](assets/java.png)](src/SignOfTheProductOfAnArray.java)                                                            |                                                                                                                                   |
 | 1826 | 🔒 [Faulty Sensor](https://leetcode.com/problems/faulty-sensor)                                                                                           |                                                                                                                                                                                      |                                                                                                                                   |
 | 1827 | [Minimum Operations to Make the Array Increasing](https://leetcode.com/problems/minimum-operations-to-make-the-array-increasing)                          |                                                    [![Java](assets/java.png)](src/MinimumOperationsToMakeTheArrayIncreasing.java)                                                    |                                                                                                                                   |
-| 1832 | [Check if the Sentence Is Pangram](https://leetcode.com/problems/check-if-the-sentence-is-pangram)                                                        |                                                                                                                                                                                      |                                                                                                                                   |
+| 1832 | [Check if the Sentence Is Pangram](https://leetcode.com/problems/check-if-the-sentence-is-pangram)                                                        |                                                            [![Java](assets/java.png)](src/CheckIfSentenceIsPangram.java)                                                             |                                                                                                                                   |
 | 1837 | [Sum of Digits in Base K](https://leetcode.com/problems/sum-of-digits-in-base-k)                                                                          |                                                                                                                                                                                      |                                                                                                                                   |
 | 1844 | [Replace All Digits with Characters](https://leetcode.com/problems/replace-all-digits-with-characters)                                                    |                                                                                                                                                                                      |                                                                                                                                   |
 | 1848 | [Minimum Distance to the Target Element](https://leetcode.com/problems/minimum-distance-to-the-target-element)                                            |                                                                                                                                                                                      |                                                                                                                                   |

src/CheckIfSentenceIsPangram.java

@@ -0,0 +1,21 @@
+// https://leetcode.com/problems/check-if-the-sentence-is-pangram
+// T: O(|s|)
+// S: O(1)
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class CheckIfSentenceIsPangram {
+    public boolean checkIfPangram(String sentence) {
+        final Set<Character> letters = getLetters(sentence);
+        return letters.size() == 26;
+    }
+
+    private Set<Character> getLetters(String s) {
+        final Set<Character> letters = new HashSet<>();
+        for (int index = 0 ; index < s.length() ; index++) {
+            letters.add(s.charAt(index));
+        }
+        return letters;
+    }
+}