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+/*
+Challenge 240
+
+Task 2: Build Array
+Submitted by: Mohammad S Anwar
+
+You are given an array of integers.
+
+Write a script to create an array such that new[i] = old[old[i]] where 0 <= i < new.length.
+Example 1
+
+Input: @int = (0, 2, 1, 5, 3, 4)
+Output: (0, 1, 2, 4, 5, 3)
+
+Example 2
+
+Input: @int = (5, 0, 1, 2, 3, 4)
+Output: (4, 5, 0, 1, 2, 3)
+*/
+
+#include <iostream>
+#include <vector>
+using namespace std;
+
+int main(int argc, char* argv[]) {
+    if (argc < 2) {
+        cerr << "Usage: ch-2 n n n ..." << endl;
+        exit(EXIT_FAILURE);
+    }
+
+    vector<int> olds;
+    vector<int> news;
+
+    // parse args
+    for (int i = 1; i < argc; i++) {
+        int n = atoi(argv[i]);
+        olds.push_back(n);
+    }
+
+    // process
+    for (size_t i = 0; i < olds.size(); i++) {
+        int n = olds[olds[i]];
+        news.push_back(n);
+    }
+
+    // output
+    const char* sep = "";
+    for (size_t i = 0; i < news.size(); i++) {
+        cout << sep << news[i];
+        sep = " ";
+    }
+    cout << endl;
+}