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+/*
+Challenge 201
+
+Task 1: Missing Numbers
+Submitted by: Mohammad S Anwar
+
+You are given an array of unique numbers.
+
+Write a script to find out all missing numbers in the range 0..$n where $n
+is the array size.
+
+Example 1
+
+Input: @array = (0,1,3)
+Output: 2
+
+The array size i.e. total element count is 3, so the range is 0..3.
+The missing number is 2 in the given array.
+
+Example 2
+
+Input: @array = (0,1)
+Output: 2
+
+The array size is 2, therefore the range is 0..2.
+The missing number is 2.
+*/
+
+#include <algorithm>
+#include <iostream>
+#include <vector>
+
+void print_missing(std::vector<int>& nums) {
+    std::sort(nums.begin(), nums.end());
+    for (size_t i = 0; i <= nums.size(); i++) {     // check 0..N
+        if (!std::binary_search(nums.begin(), nums.end(), i))
+            std::cout << i << " ";
+    }
+    std::cout << std::endl;
+}
+
+int main(int argc, char* argv[]) {
+    argv++; argc--;
+    if (argc == 0) {
+        std::cerr << "usage: ch-1 nums..." << std::endl;
+        exit(EXIT_FAILURE);
+    }
+
+    std::vector<int> nums;
+    for (int i = 0; i < argc; i++)
+        nums.push_back(atoi(argv[i]));
+    print_missing(nums);
+}