sansa-and-xor: initial commit

algorithms/bit-manipulation/sansa-and-xor/README.md

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+<https://www.hackerrank.com/challenges/sansa-and-xor>

algorithms/bit-manipulation/sansa-and-xor/solution.cpp

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+#include <iostream>
+
+int main()
+{
+    using namespace std;
+    size_t T;
+    cin >> T;
+
+    while (T--) {
+
+        size_t N;
+        cin >> N;
+
+        int value, result;
+        result = 0;
+
+        for (size_t i = 0; i < N; ++i) {
+
+            cin >> value;
+
+            if (((i + 1) & 1) && ((N - i) & 1))
+                result ^= value;
+        }
+
+        cout << (result^0) << endl;
+    }
+
+    return 0;
+}