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+/*
+Challenge 195
+
+Task 1: Special Integers
+Submitted by: Mohammad S Anwar
+You are given a positive integer, $n > 0.
+
+Write a script to print the count of all special integers between 1 and $n.
+
+An integer is special when all of its digits are unique.
+
+Example 1:
+Input: $n = 15
+Output: 14 as except 11 all other integers between 1 and 15 are spcial.
+Example 2:
+Input: $n = 35
+Output: 32 as except 11, 22, 33 all others are special.
+*/
+
+#include <iostream>
+
+bool is_special_int(int n) {
+    bool digits[10]={0};
+    while (n>0) {
+        int digit=n%10;
+        n/=10;
+        if (digits[digit])
+            return false;
+        digits[digit]=true;
+    }
+    return true;
+}
+
+int count_special_ints(int n) {
+    int count=0;
+    for (int i=1; i<=n; i++)
+        if (is_special_int(i))
+            count++;
+    return count;
+}
+
+int main(int argc, char* argv[]) {
+    argv++; argc--;
+    if (argc != 1) {
+        std::cerr<<"usage: ch-1 n"<<std::endl;
+        return EXIT_FAILURE;
+    }
+
+    int n=atoi(argv[0]);
+    std::cout<<count_special_ints(n)<<std::endl;
+}