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diff --git a/challenge-242/paulo-custodio/cpp/ch-1.cpp b/challenge-242/paulo-custodio/cpp/ch-1.cpp
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+/*
+Challenge 242
+
+Task 1: Missing Members
+Submitted by: Mohammad S Anwar
+You are given two arrays of integers.
+
+Write a script to find out the missing members in each other arrays.
+
+Example 1
+Input: @arr1 = (1, 2, 3)
+       @arr2 = (2, 4, 6)
+Output: ([1, 3], [4, 6])
+
+(1, 2, 3) has 2 members (1, 3) missing in the array (2, 4, 6).
+(2, 4, 6) has 2 members (4, 6) missing in the array (1, 2, 3).
+Example 2
+Input: @arr1 = (1, 2, 3, 3)
+       @arr2 = (1, 1, 2, 2)
+Output: ([3])
+
+(1, 2, 3, 3) has 2 members (3, 3) missing in the array (1, 1, 2, 2). Since they are same, keep just one.
+(1, 1, 2, 2) has 0 member missing in the array (1, 2, 3, 3).
+*/
+
+#include <algorithm>
+#include <iostream>
+#include <regex>
+#include <string>
+#include <vector>
+using namespace std;
+
+vector<string> regex_split(const string& s, const regex& sep_regex = regex{ "\\s+" }) {
+    sregex_token_iterator iter(s.begin(), s.end(), sep_regex, -1);
+    sregex_token_iterator end;
+    return { iter, end };
+}
+
+vector<int> parse_list(const string& text) {
+    vector<int> result;
+    auto nums = regex_split(text, regex{ "[\\[\\](),; \\t]+" });
+    for (auto& num : nums) {
+        if (!num.empty()) {
+            int n = stoi(num);
+            result.push_back(n);
+        }
+    }
+    sort(result.begin(), result.end());
+    return result;
+}
+
+vector<int> find_not_in(const vector<int>& arr1, const vector<int>& arr2) {
+    vector<int> result;
+    for (auto& n : arr1) {
+        if (!binary_search(arr2.begin(), arr2.end(), n))
+            if (!binary_search(result.begin(), result.end(), n))
+                result.push_back(n);
+    }
+    return result;
+}
+
+void print_list(const vector<int>& arr) {
+    cout << "[";
+    string sep = "";
+    for (auto& n : arr) {
+        cout << sep << n;
+        sep = ", ";
+    }
+    cout << "]";
+}
+
+void print_result(const vector<int>& arr1, const vector<int>& arr2) {
+    cout << "(";
+    string sep = "";
+    if (!arr1.empty()) {
+        cout << sep;
+        print_list(arr1);
+        sep = ", ";
+    }
+    if (!arr2.empty()) {
+        cout << sep;
+        print_list(arr2);
+        sep = ", ";
+    }
+    cout << ")";
+}
+
+int main(int argc, char* argv[]) {
+    if (argc != 3) {
+        cerr << "Usage: ch-1 '(a,b,c)' '(d,e,f)'" << endl;
+        exit(EXIT_FAILURE);
+    }
+
+    auto arr1 = parse_list(argv[1]);
+    auto arr2 = parse_list(argv[2]);
+
+    auto not_in1 = find_not_in(arr1, arr2);
+    auto not_in2 = find_not_in(arr2, arr1);
+
+    print_result(not_in1, not_in2);
+}