add 2894

Author: fishercoder1534

paginated_contents/algorithms/3rd_thousand/README.md

@@ -6,6 +6,7 @@
 | 2965 | [Find Missing and Repeated Values](https://leetcode.com/problems/find-missing-and-repeated-values/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2965.java)                                       |                                      | Easy                                     |
 | 2942 | [Find Words Containing Character](https://leetcode.com/problems/find-words-containing-character/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2942.java)                                       |                                      | Easy                                     |
 | 2937 | [Make Three Strings Equal](https://leetcode.com/problems/make-three-strings-equal/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2937.java)                                       |                                      | Easy                                     |
+| 2894 | [Divisible and Non-divisible Sums Difference](https://leetcode.com/problems/divisible-and-non-divisible-sums-difference/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2894.java)                                       |                                      | Easy                                     |
 | 2873 | [Maximum Value of an Ordered Triplet I](https://leetcode.com/problems/maximum-value-of-an-ordered-triplet-i/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2873.java)                                       |                                      | Easy                                     |
 | 2869 | [Minimum Operations to Collect Elements](https://leetcode.com/problems/minimum-operations-to-collect-elements/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2869.java)                                       |                                      | Easy                                     |
 | 2864 | [Maximum Odd Binary Number](https://leetcode.com/problems/maximum-odd-binary-number/)                                                                                                             | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2864.java)                                       |                                      | Easy                                     |Greedy

src/main/java/com/fishercoder/solutions/thirdthousand/_2894.java

@@ -0,0 +1,18 @@
+package com.fishercoder.solutions.thirdthousand;
+
+public class _2894 {
+    public static class Solution1 {
+        public int differenceOfSums(int n, int m) {
+            int sum1 = 0;
+            int sum2 = 0;
+            for (int num = 1; num <= n; num++) {
+                if (num % m != 0) {
+                    sum1 += num;
+                } else {
+                    sum2 += num;
+                }
+            }
+            return sum1 - sum2;
+        }
+    }
+}