Add multilingual language and systems learning tracks

ceb/cpp-practice-20261101/lesson-3/main.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include <cassert>
+int remaining(int total, int done) { return done >= total ? 0 : total - done; }
+int main() {
+    assert(remaining(4,1)==3);
+    assert(remaining(4,4)==0);
+    assert(remaining(4,5)==0);
+    assert(remaining(0,0)==0);
+    std::cout << "Nipasar\n";
+}