Initial data commit

Task/Combinations/Java/combinations.java

@@ -0,0 +1,30 @@
+import java.util.Collections;
+import java.util.LinkedList;
+
+public class Comb{
+
+        public static void main(String[] args){
+                System.out.println(comb(3,5));
+        }
+
+        public static String bitprint(int u){
+                String s= "";
+                for(int n= 0;u > 0;++n, u>>= 1)
+                        if((u & 1) > 0) s+= n + " ";
+                return s;
+        }
+
+        public static int bitcount(int u){
+                int n;
+                for(n= 0;u > 0;++n, u&= (u - 1));//Turn the last set bit to a 0
+                return n;
+        }
+
+        public static LinkedList<String> comb(int c, int n){
+                LinkedList<String> s= new LinkedList<String>();
+                for(int u= 0;u < 1 << n;u++)
+                        if(bitcount(u) == c) s.push(bitprint(u));
+                Collections.sort(s);
+                return s;
+        }
+}