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diff --git a/challenge-009/paulo-custodio/cpp/ch-1.cpp b/challenge-009/paulo-custodio/cpp/ch-1.cpp
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+/*
+Challenge 009
+
+Challenge #1
+Write a script that finds the first square number that has at least 5 distinct
+digits.This was proposed by Laurent Rosenfeld.
+*/
+
+#include <iostream>
+using namespace std;
+
+int num_diff_digits(int n) {
+    bool digits[10] = {0};
+    int count = 0;
+    while (n > 0) {
+        int digit = n % 10;
+        n /= 10;
+        if (!digits[digit]) {
+            digits[digit] = true;
+            count++;
+        }
+    }
+    return count;
+}
+
+int main(int argc, char* argv[]) {
+    int num = 0;
+    if (argc == 2)
+        num = atoi(argv[1]);
+    if (num == 0)
+        num = 5;
+
+    int n = 1;
+    while (num_diff_digits(n * n) < num)
+        n++;
+    cout << n * n << endl;
+}