[Hacker Rank]: A Very Big Sum solved ✓

Author: Gonzalo Diaz

algorithm-exercises-csharp-test/src/hackerrank/warmup/AVeryBigSumTest.cs

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+namespace algorithm_exercises_csharp.hackerrank;
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+[TestClass]
+public class AVeryBigSumTest
+{
+  public class AVeryBigSumTestCase
+  {
+    public List<long> ar = [];
+    public long expected = 0;
+  }
+
+  private static readonly AVeryBigSumTestCase[] tests = [
+    new()
+    {
+      ar = [1000000001, 1000000002, 1000000003, 1000000004, 1000000005],
+      expected = 5000000015
+    }
+  ];
+
+  [TestMethod]
+  public void testSimpleArraySum()
+  {
+    long result;
+
+    foreach (AVeryBigSumTestCase test in tests)
+    {
+      result = AVeryBigSum.aVeryBigSum(test.ar);
+      Assert.AreEqual(test.expected, result);
+    }
+  }
+}
+

algorithm-exercises-csharp/src/hackerrank/warmup/AVeryBigSum.cs

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+// @link Problem definition [[docs/hackerrank/warmup/a_very_big_sum.md]]
+
+namespace algorithm_exercises_csharp.hackerrank;
+
+using System.Diagnostics.CodeAnalysis;
+
+public class AVeryBigSum
+{
+  [ExcludeFromCodeCoverage]
+  protected AVeryBigSum() { }
+
+  public static long aVeryBigSum(List<long> _ar)
+  {
+    var total = 0L;
+
+    foreach (long x in _ar)
+    {
+      total += x;
+    }
+
+    return total;
+  }
+}

docs/hackerrank/warmup/a_very_big_sum.md

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+# [A Very Big Sum](https://www.hackerrank.com/challenges/a-very-big-sum)
+
+Difficulty: #easy
+Category: #warmup
+
+In this challenge, you are required to calculate and print the
+sum of the elements in an array, keeping in mind that some of
+those integers may be quite large.
+
+## Function Description
+
+Complete the aVeryBigSum function in the editor below.
+It must return the sum of all array elements.
+
+aVeryBigSum has the following parameter(s):
+
+- int ar[n]: an array of integers.
+
+## Return
+
+- long: the sum of all array elements
+
+## Input Format
+
+The first line of the input consists of an integer n.
+The next line contains  space-separated integers contained in the array.
+
+## Output Format
+
+Return the integer sum of the elements in the array.
+
+## Constraints
+
+$ 1 <= n < 10 $ \
+$ 0 <= ar[i] <= 10^10 $
+
+## Sample Input
+
+```text
+5
+1000000001 1000000002 1000000003 1000000004 1000000005
+```
+
+## Output
+
+```text
+5000000015
+```
+
+## Note
+
+The range of the 32-bit integer is
+($ -2^31 $) to ($ 2^31 - 1 $) or $ [-2147483648, 2147483647] $
+When we add several integer values, the resulting sum might exceed the
+above range. You might need to use long int C/C++/Java to store such sums.