Data commit

Task/Happy-numbers/Dart/happy-numbers.dart

@@ -0,0 +1,35 @@
+main() {
+  HashMap<int,bool> happy=new HashMap<int,bool>();
+  happy[1]=true;
+
+  int count=0;
+  int i=0;
+
+  while(count<8) {
+    if(happy[i]==null) {
+      int j=i;
+      Set<int> sequence=new Set<int>();
+      while(happy[j]==null && !sequence.contains(j)) {
+        sequence.add(j);
+        int sum=0;
+        int val=j;
+        while(val>0) {
+          int digit=val%10;
+          sum+=digit*digit;
+          val=(val/10).toInt();
+        }
+        j=sum;
+      }
+      bool sequenceHappy=happy[j];
+      Iterator<int> it=sequence.iterator();
+      while(it.hasNext()) {
+        happy[it.next()]=sequenceHappy;
+      }
+    }
+    if(happy[i]) {
+      print(i);
+      count++;
+    }
+    i++;
+  }
+}