diff --git a/index.js b/index.js
index 4ea6312..ec94bd4 100644
--- a/index.js
+++ b/index.js
@@ -1,22 +1,24 @@
-function moveZeros(arr = '') {
-  function twistIt(str = '') {
-    return str.split('').map((a, i, arr) => arr[arr.length - i - 1]).join('')
+function hasCycle(head) {
+  let nodes = [];
+  while (head) {
+    nodes.push(head.data);
+    head = head.next;
   }
-  return arr.split(' ').map(item => twistIt(item)).join(' ')
-}
-
-console.log(moveZeros("double  spaces"), "double  spaces", '==>', "elbuod  secaps")
-console.log(moveZeros("double  spaces"), "double  spaces", '==>', "elbuod  secaps")
-console.log(moveZeros("double  spaces"), "double  spaces", '==>', "elbuod  secaps")
-
-function manhattanDistance(arr0, arr1) {
-  function fn(params) {
-
-    return Math.abs(params)
+  nodes = nodes.reduce((acc = [], item, i, arr) => {
+    if (i < arr.length - 1) acc.push([item, arr[i + 1]]);
+    return acc;
+  }, []);
+  for (const node of nodes) {
+    if (nodes.find((item) => item === node.reverse())) return 1;
   }
-  return (fn(arr0[0] - arr1[0]) + fn(arr0[1] - arr1[1]))
+  return 0;
 }
 
-console.log(manhattanDistance([1, 1], [1, 1]), '=> returns 0')
-console.log(manhattanDistance([5, 4], [3, 2]), '=> returns 4')
-console.log(manhattanDistance([1, 1], [0, 3]), '=> returns 3')
+let nodeList = {
+  data: 1,
+
+  next: { data: -1, next: { data: 1, next: null } },
+};
+console.log(hasCycle(nodeList));
+nodeList = { data: -1, next: null };
+// console.log(hasCycle(nodeList));
diff --git a/package-lock.json b/package-lock.json
index f61b636..45221c0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2115,9 +2115,9 @@
       }
     },
     "node_modules/prettier": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.3.2.tgz",
-      "integrity": "sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.2.1.tgz",
+      "integrity": "sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q==",
       "dev": true,
       "bin": {
         "prettier": "bin-prettier.js"
@@ -4244,9 +4244,9 @@
       "dev": true
     },
     "prettier": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.3.2.tgz",
-      "integrity": "sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.2.1.tgz",
+      "integrity": "sha512-PqyhM2yCjg/oKkFPtTGUojv7gnZAoG80ttl45O6x2Ug/rMJw4wcc9k6aaf2hibP7BGVCCM33gZoGjyvt9mm16Q==",
       "dev": true
     },
     "progress": {