1 files changed, 41 insertions, 0 deletions
diff --git a/challenge-159/ulrich-rieke/cpp/ch-2.cpp b/challenge-159/ulrich-rieke/cpp/ch-2.cpp
new file mode 100644
index 0000000000..85ae8382fe
--- /dev/null
+++ b/challenge-159/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,41 @@
+#include <iostream>
+#include <vector>
+#include <set>
+#include <cstdlib>
+
+//the smallest current divisor of a number is a prime number
+std::vector<int> primeDecompose( int n ) {
+  std::vector<int> primes ;
+  int current = 2 ;
+  while ( n != 1 ) {
+      if ( n % current == 0 ) {
+    primes.push_back( current ) ;
+    n /= current ;
+      }
+      else
+    current++ ;
+  }
+  return primes ;
+}
+
+int main( int argc, char * argv[] ) {
+  int n = std::atoi( argv[1] ) ;
+  while ( n <= 0 ) {
+      std::cout << "Please enter a number greater than 0!\n" ;
+      std::cin >> n ;
+  }
+  std::vector<int> primes { primeDecompose( n ) } ;
+  std::set<int> uniqueNums( primes.begin( ) , primes.end( ) ) ;
+  int pl = primes.size( ) ;
+  int ul = uniqueNums.size( ) ;
+  if ( pl == ul ) {
+      if ( pl % 2 == 0 )
+    std::cout << 1 ;
+      else
+    std::cout << -1 ;
+  }
+  else
+      std::cout << 0 ;
+  std::cout << std::endl ;
+  return 0 ;
+}