diff --git a/src/index.js b/src/index.js
index 4101a36..70152f4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,7 +4,36 @@
  * @returns {number[][]}
  */
 const findNodesWithZeroAndOneParents = (parentChildPairs) => {
+  let result = []
+  parentChildPairs.forEach(family => {
+    family.forEach((member, index) => {
+      const actual = result.find((element) => {
+        if(member === element.member) {
+          index === 0 ? element.asParent++ : element.asChild++
+          return true
+        }
+      })
 
+      if(actual === undefined) {
+        if (index === 0) {
+          result.push({ member, asParent: 1, asChild: 0 })
+        } else {
+          result.push({ member, asParent: 0, asChild: 1 })
+        }
+      }
+    })
+    
+  })
+
+  let [ zeroParents, oneParents ] = [ [], [] ]
+  result.forEach((member) => {
+    if (member.asChild === 0) zeroParents.push(member.member)
+    if (member.asChild === 1) oneParents.push(member.member)
+  })
+
+  //console.log('result :: ', result)
+  // console.log('result :: ', [zeroParents, oneParents])
+  return [zeroParents, oneParents]
 }
 
 module.exports = findNodesWithZeroAndOneParents;
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