diff --git a/docs/hackerrank/warmup/simple_array_sum.md b/docs/hackerrank/warmup/simple_array_sum.md
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+# [Simple Array Sum](https://www.hackerrank.com/challenges/simple-array-sum/problem)
+
+Difficulty: #easy
+Category: #warmup
+
+Given an array of integers, find the sum of its elements.
+For example, if the array $ ar = [1, 2, 3], 1 + 2 + 3 = 6 $, so return $ 6 $.
+
+## Function Description
+
+Complete the simpleArraySum function in the editor below. It must return the sum
+ of the array elements as an integer.
+simpleArraySum has the following parameter(s):
+
+- ar: an array of integers
+
+## Input Format
+
+The first line contains an integer, , denoting the size of the array.
+The second line contains  space-separated integers representing the array's elements.
+
+## Constraints
+
+$ 0 < n, ar[i] \leq 1000 $
+
+## Output Format
+
+Print the sum of the array's elements as a single integer.
+
+## Sample Input
+
+```text
+6
+1 2 3 4 10 11
+```
+
+## Sample Output
+
+```text
+31
+```
+
+## Explanation
+
+We print the sum of the array's elements: $ 1 + 2 + 3 + 4 + 10 + 11 = 31 $.
diff --git a/src/lib/exercises/include/exercises/hackerrank/warmup/simple_array_sum.hpp b/src/lib/exercises/include/exercises/hackerrank/warmup/simple_array_sum.hpp
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+++ b/src/lib/exercises/include/exercises/hackerrank/warmup/simple_array_sum.hpp
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+#include <iostream>
+#include <vector>
+
+#pragma once
+
+namespace hackerrank::warmup {
+    int simpleArraySum(std::vector<int> ar);
+}
diff --git a/src/lib/exercises/src/hackerrank/warmup/simple_array_sum.cpp b/src/lib/exercises/src/hackerrank/warmup/simple_array_sum.cpp
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+++ b/src/lib/exercises/src/hackerrank/warmup/simple_array_sum.cpp
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+#include <exercises/hackerrank/warmup/simple_array_sum.hpp>
+
+/**
+ * @link Problem definition [[docs/hackerrank/warmup/simple_array_sum.md]]
+ */
+
+#include <iostream>
+#include <cmath>
+#include <vector>
+
+using namespace std;
+
+string ltrim(const string &);
+string rtrim(const string &);
+vector<string> split(const string &);
+
+
+namespace hackerrank::warmup {
+
+    int simpleArraySum(std::vector<int> ar) {
+        int accum = 0;
+
+        for(const int i : ar)  {
+            accum += i;
+        }
+        return accum;
+    }
+
+}
diff --git a/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp b/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp
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+++ b/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp
@@ -0,0 +1,26 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include <exercises/hackerrank/warmup/simple_array_sum.hpp>
+#include <iostream>
+#include <vector>
+
+#include <filesystem>
+#include <fstream>
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+
+TEST_CASE("simpleArraySum", "[warmup]")
+{
+    std::filesystem::path cwd = std::filesystem::current_path();
+    std::string path = cwd.string() + "/unit/lib/hackerrank/warmup/simple_array_sum.testcase.json";
+
+    INFO("simpleArraySum JSON test cases FILE: " << path);
+
+    std::ifstream f(path);
+    json data = json::parse(f);
+
+    for (auto testcase : data) {
+        int result = hackerrank::warmup::simpleArraySum(testcase["input"]);
+        CHECK(result == testcase["expected"]);
+    }
+}
diff --git a/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.testcase.json b/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.testcase.json
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+++ b/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.testcase.json
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+[
+  {
+    "input": [1, 2, 3, 4, 10, 11],
+    "expected": 31
+  }
+]