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+/*
+Challenge 003
+
+Challenge #2
+Create a script that generates Pascal Triangle. Accept number of rows from
+the command line. The Pascal Triangle should have at least 3 rows. For more
+information about Pascal Triangle, check this wikipedia page.
+
+*/
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+void draw_pascal(int rows) {
+    // allocate current and next row
+    std::vector<int> data[2];
+    for (int i = 0; i < 2; i++)
+        data[i].resize(rows+1);
+
+    int cur = 0;
+    data[cur][0] = 1;
+    for (int row = 1; row <= rows; row++) {
+        // print current row
+        for (int col = 0; col < rows-row; col++)
+            std::cout << ' ';
+        for (int col = 0; col < row; col++)
+            std::cout << data[cur][col] << ' ';
+        std::cout << std::endl;
+
+        // compute next row
+        int nxt = 1-cur;
+        data[nxt][0] = 1;
+        data[nxt][row] = 1;
+        for (int col = 1; col < row; col++)
+            data[nxt][col] = data[cur][col-1] + data[cur][col];
+        cur = nxt;
+    }
+}
+
+int main(int argc, char* argv[]) {
+    if (argc == 2)
+        draw_pascal(atoi(argv[1]));
+}