add solutions

1 files changed, 28 insertions, 0 deletions

diff --git a/challenge-252/witawayar/cpp/ch-2.cpp b/challenge-252/witawayar/cpp/ch-2.cpp
new file mode 100644
index 0000000000..91b103757b
--- /dev/null
+++ b/challenge-252/witawayar/cpp/ch-2.cpp
@@ -0,0 +1,28 @@
+// g++ -Wall -Wextra -Wpedantic -std=c++17 cpp/ch-2.cpp
+#include <iostream>   // cout
+#include <numeric>    // accumulate
+#include <sstream>    // stringstream
+#include <vector>
+
+std::vector<int> fun(int const& n) {
+    std::vector<int> range(n);
+    std::iota(range.begin(), range.end(), -(n / 2));
+    return range;
+}
+
+int main(void) {
+    // Tests
+    std::vector<unsigned> tests{5, 3, 1};
+
+    for (const unsigned& input : tests) {
+        std::vector<int> got = fun(input);
+        int sum = std::accumulate(got.cbegin(), got.cend(), 0);
+        if (sum != 0) {
+            std::stringstream error_msg;
+            error_msg << "Expected " << 0 << ", got " << sum;
+            throw std::runtime_error(error_msg.str());
+        }
+    }
+
+    std::cout << "done-testing, success\n";
+}