diff --git a/src/index.js b/src/index.js
index 4101a36..ebe7d4b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -3,8 +3,41 @@
  * @param {number[][]} parentChildPairs
  * @returns {number[][]}
  */
+//           1   2    4
+//            \ /   / | \
+//             3   5  8  9
+//             \  / \     \
+//               6   7    11
+
 const findNodesWithZeroAndOneParents = (parentChildPairs) => {
+let parentsUnique = [];
+let childOneParent = [];
+
+parentChildPairs.forEach(pairs => {
+  let numberOfParents = 0;
+  let ChildrenOf = 0;
 
+  for(let i = 0; i < parentChildPairs.length; i++){
+    if(pairs[0] === parentChildPairs[i][1]){
+      ChildrenOf++;
+      }
+    if(pairs[1] === parentChildPairs[i][1]){
+      numberOfParents++
+      }
+    }
+    if(ChildrenOf === 0 && !parentsUnique.includes(pairs[0])){
+      parentsUnique.push(pairs[0]);
+    }
+    if(numberOfParents === 1 && !childOneParent.includes(pairs[1])){
+      childOneParent.push(pairs[1])
+    }
+  });
+  return res = [parentsUnique.sort((a,b) => a-b), childOneParent.sort((a,b) => a-b)];
 }
 
-module.exports = findNodesWithZeroAndOneParents;
\ No newline at end of file
+
+//parentChildPairs([[1, 3], [ 2, 3 ], [3, 6 ], [5, 6 ], [5, 7 ] , [4, 5], [4, 8 ], [4, 9], [9, 11]])
+//findNodesWithZeroAndOneParents(parentChildPairs)
+
+
+module.exports = findNodesWithZeroAndOneParents;