diff --git a/src/index.js b/src/index.js
index 4101a36..09ded41 100644
--- a/src/index.js
+++ b/src/index.js
@@ -3,8 +3,35 @@
  * @param {number[][]} parentChildPairs
  * @returns {number[][]}
  */
+
 const findNodesWithZeroAndOneParents = (parentChildPairs) => {
+  let uniqueParents = [];
+  let vertexWithOneParent = [];
+
+  parentChildPairs.forEach(pairs => {
+    let isChildrenOf = 0;         
+    let numbOfParents = 0;
+
+    for(let i = 0; i < parentChildPairs.length; i++){
+      if(pairs[0] === parentChildPairs[i][1]){
+        isChildrenOf++;
+      }
+      if(pairs[1] === parentChildPairs[i][1]){
+        numbOfParents++
+      }
+    }
 
+    if(isChildrenOf === 0 && !uniqueParents.includes(pairs[0])){
+        uniqueParents.push(pairs[0]);
+    }
+    if(numbOfParents === 1 && !vertexWithOneParent.includes(pairs[1])){
+      vertexWithOneParent.push(pairs[1])
+    } 
+
+  });
+
+  return [uniqueParents.sort((a,b) => a-b), vertexWithOneParent.sort((a,b) => a-b)];
 }
 
+
 module.exports = findNodesWithZeroAndOneParents;
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