Added sum exercise

src/main/java/tudelft/caesarshift/CaesarShiftCipher.java

@@ -1,4 +1,4 @@
-package tudelft.partition.exercise.caesarshift;
+package tudelft.caesarshift;
 
 public class CaesarShiftCipher {
 

src/main/java/tudelft/sum/TwoNumbersSum.java

@@ -0,0 +1,31 @@
+package tudelft.sum;
+
+import java.util.ArrayList;
+import java.util.Collections;
+
+// Source: https://leetcode.com/problems/add-two-numbers/description/
+class TwoNumbersSum {
+
+ public ArrayList<Integer> addTwoNumbers(ArrayList<Integer> first, ArrayList<Integer> second) {
+ Collections.reverse(first);
+ Collections.reverse(second);
+
+ int complement = 0;
+ ArrayList<Integer> result = new ArrayList<>();
+
+ for(int i = 0; i < Math.max(first.size(), second.size()); i++){
+ int firstVal = i < first.size() ? first.get(i) : 0;
+ int secondVal = i < second.size() ? second.get(i) : 0;
+ int total = firstVal + secondVal + complement;
+ complement = 0;
+ if (total >= 10){
+ complement = 1;
+ total -= 10;
+ }
+ result.add(i, total);
+ }
+
+ Collections.reverse(result);
+ return result;
+ }
+}

src/test/java/tudelft/sum/TwoNumbersSumTest.java

@@ -0,0 +1,5 @@
+package tudelft.sum;
+
+public class TwoNumbersSumTest {
+
+}