Added some initial data likle Makefiles and .gitignore.

.gitignore

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+*.o
+SM-MaponiA3

.vscode/settings.json

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+{
+    "files.associations": {
+        "ostream": "cpp",
+        "new": "cpp"
+    }
+}

Makefile

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+CC=icc
+CXX=icpc
+CFLAGS=
+
+DEPS = SM-MaponiA3.cpp
+OBJ = SM-MaponiA3.o 
+
+%.o: %.c $(DEPS)
+	$(CXX) -c -o $@ $< $(CFLAGS)
+
+SM-MaponiA3: $(OBJ)
+	$(CXX) -o $@ $^ $(CFLAGS)

SM-MaponiA3.cpp

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+// Algorithm 3 from P. Maponi,
+// p. 283, doi:10.1016/j.laa.2006.07.007
+
+#include <iostream>
+using namespace std;
+
+int M=3;
+int N=3;
+
+int main() {
+
+    int** A = new int*[N];
+    for (int i = 0; i < N; i++) {
+        A[i] = new int[M];
+    }
+    A[0][0] = 1;
+    A[0][1] = 1;
+    A[0][2] = -1;
+    A[1][0] = 1;
+    A[1][1] = 1;
+    A[1][2] = 0;
+    A[2][0] = -1;
+    A[2][1] = 0;
+    A[2][2] = -1;
+
+    for (int i = 0; i < M; i++) {
+        for (int j = 0; j < N; j++) {
+            cout << "A["<<i<<"]["<<j<<"] = " << A[i][j] << " ";
+        }
+        cout << endl;
+    }
+
+    for (int i = 0; i < N; i++) {
+        delete [] A[i];
+    }
+    delete [] A;
+
+    return 0;
+}