Completed.

1 files changed, 28 insertions, 4 deletions

diff --git a/unique-char.cpp b/unique-char.cpp
index b8120b2..05e0883 100644
--- a/unique-char.cpp
+++ b/unique-char.cpp
@@ -2,17 +2,33 @@
 #include <cstdlib>
 #include <cstring>
 #include <iostream>
+#include <exception>
+#include <vector>
 
 using namespace std;
 
 bool is_unique(const char* p, size_t n)
 {
-    static const char offset = 'a';
-    size_t counts[26];
+    // ASCII range is 32-126
+    vector<bool> counts(95, false);
     for (size_t i = 0; i < n; ++i, ++p)
     {
         char c = *p;
-        cout << *p << endl;
+
+        cout << c << endl;
+
+        if (c < 32)
+            throw exception();
+
+        size_t pos = c - 32;
+
+        if (pos >= 95)
+            throw exception();
+
+        if (counts[pos])
+            return false;
+
+        counts[pos] = true;
     }
 
     return true;
@@ -30,7 +46,15 @@ int main(int argc, char** argv)
 
     size_t n = strlen(argv[1]);
     const char* p = argv[1];
-    cout << "all characters are unique: " << (is_unique(p, n) ? "yes" : "no") << endl;
+
+    try
+    {
+        cout << "all characters are unique: " << (is_unique(p, n) ? "yes" : "no") << endl;
+    }
+    catch (...)
+    {
+        cout << "failed to parse the string" << endl;
+    }
 
     return EXIT_SUCCESS;
 }