1 files changed, 63 insertions, 0 deletions
diff --git a/impls/pingala.cpp b/impls/pingala.cpp
new file mode 100644
index 0000000..510aa50
--- /dev/null
+++ b/impls/pingala.cpp
@@ -0,0 +1,63 @@
+/* pingala.cpp
+ * Created: 2024-09-15
+ * Author: Aryadev Chavali
+ */
+
+#include <cstdio>
+#include <string>
+#include <vector>
+
+void padding(size_t n, size_t depth)
+{
+  for (size_t i = 0; i < ((depth - n) / 2); ++i)
+    printf("\t");
+}
+
+void generate_triangle(const size_t depth)
+{
+  std::vector<size_t> items;
+  items.reserve(depth * depth);
+#define AT(i, j) items[((i) * depth) + (j)]
+  AT(0, 0) = 1;
+  padding(0, depth);
+  printf("%lu\n", items[0]);
+  for (size_t i = 1; i < depth; ++i)
+  {
+    AT(i, 0) = 1;
+    padding(i, depth);
+    printf("%lu,\t", AT(i, 0));
+    for (size_t j = 1; j < i; ++j)
+    {
+      // Recurrence relation
+      AT(i, j) = AT(i - 1, j - 1) + AT(i - 1, j);
+      printf("%lu,\t", AT(i, j));
+    }
+    AT(i, i) = 1;
+    printf("%lu\n", AT(i, i));
+  }
+#undef AT
+}
+
+void usage(FILE *fp)
+{
+  fprintf(fp, "Usage: pingala.out [depth]\n"
+              "\tdepth: Depth of triangle generated\n");
+}
+
+int main(int argc, char *argv[])
+{
+  if (argc < 2)
+  {
+    usage(stderr);
+    return 1;
+  }
+  int arg = std::stoi(argv[1]);
+  if (arg <= 0)
+  {
+    usage(stderr);
+    return 1;
+  }
+
+  generate_triangle(arg);
+  return 0;
+}