diff --git a/Sources/ElementaryCycles/Private/ElementaryCyclesSearch+toArray.swift b/Sources/ElementaryCycles/Private/ElementaryCyclesSearch+toArray.swift
index 7e11591..44a351e 100644
--- a/Sources/ElementaryCycles/Private/ElementaryCyclesSearch+toArray.swift
+++ b/Sources/ElementaryCycles/Private/ElementaryCyclesSearch+toArray.swift
@@ -15,7 +15,7 @@ import Swift
 import ElementaryCyclesSearch
 
 extension ElementaryCyclesSearch {
-    static func toArray(elementaryCycles: Vector<Vector<Node>>) -> [[Node]] {
+    static func toArray(elementaryCycles: Array<Array<Node>>) -> [[Node]] {
         var cycles = [[Node]]()
         for vector in elementaryCycles {
             var cycle = [Node]()
diff --git a/Sources/ElementaryCycles/Public/ElementaryCycles.swift b/Sources/ElementaryCycles/Public/ElementaryCycles.swift
index c23a479..8e133a0 100644
--- a/Sources/ElementaryCycles/Public/ElementaryCycles.swift
+++ b/Sources/ElementaryCycles/Public/ElementaryCycles.swift
@@ -18,7 +18,7 @@ public struct ElementaryCycles {
     public static func find<Node: Hashable>(graph: [Node: [Node]], sort: ((Node, Node) -> Bool)? = nil) -> [[Node]] {
         let nodes = AdjacencyMatrix.getNodes(graph: graph, sort: sort)
         let adjacencyMatrix = try! AdjacencyMatrix.getAdjacencyMatrix(nodes: nodes, adjacencyDictionary: graph)
-        let elementaryCycles = ElementaryCyclesSearch.getElementaryCycles(adjacencyMatrix: adjacencyMatrix, graphNodes: Vector(array: nodes))
+        let elementaryCycles = ElementaryCyclesSearch.getElementaryCycles(adjacencyMatrix: adjacencyMatrix, graphNodes: nodes)
         return ElementaryCyclesSearch.toArray(elementaryCycles: elementaryCycles)
     }
 }
diff --git a/Sources/ElementaryCyclesSearch/Private/AdjacencyList+getAdjacencyList.swift b/Sources/ElementaryCyclesSearch/Private/AdjacencyList+getAdjacencyList.swift
index 46e8c31..cfc7c7e 100644
--- a/Sources/ElementaryCyclesSearch/Private/AdjacencyList+getAdjacencyList.swift
+++ b/Sources/ElementaryCyclesSearch/Private/AdjacencyList+getAdjacencyList.swift
@@ -39,16 +39,16 @@ extension Matrix where Element == Int {
         let list = Matrix<Int>(adjacencyMatrix.reservedLength)
         
         for i in 0 ..< adjacencyMatrix.reservedLength {
-            let v = Vector<Int>()
+            var v = Array<Int>()
             for j in 0 ..< adjacencyMatrix[i].reservedLength {
                 if let isAdjacent = adjacencyMatrix[i]?[j], isAdjacent {
-                    v.add(j)
+                    v.append(j)
                 }
             }
-            
-            list[i] = Vector(v.size)
-            for j in 0 ..< v.size {
-                let integer = v.get(j)
+
+            list[i] = Vector(v.count)
+            for j in 0 ..< v.count {
+                let integer = v[j]
                 list[i][j] = integer
             }
         }
diff --git a/Sources/ElementaryCyclesSearch/Private/StrongConnectedComponents.swift b/Sources/ElementaryCyclesSearch/Private/StrongConnectedComponents.swift
index 4c48592..9c60e69 100644
--- a/Sources/ElementaryCyclesSearch/Private/StrongConnectedComponents.swift
+++ b/Sources/ElementaryCyclesSearch/Private/StrongConnectedComponents.swift
@@ -77,7 +77,7 @@ class StrongConnectedComponents {
     private var visited: Vector<Bool>!
     
     /** Helpattribute for finding scc's */
-    private var stack: Vector<Int>!
+    private var stack: Array<Int>!
     
     /** Helpattribute for finding scc's */
     private var lowlink: Vector<Int>!
@@ -89,7 +89,7 @@ class StrongConnectedComponents {
     private var strongConnectedComponentsCounter = 0;
     
     /** Helpattribute for finding scc's */
-    private var currentStrongConnectedComponents: Vector<Vector<Int>>!
+    private var currentStrongConnectedComponents: Array<Array<Int>>!
     
     /**
      * Constructor.
@@ -116,9 +116,9 @@ class StrongConnectedComponents {
         lowlink = Vector<Int>(self.adjacencyListOriginal.reservedLength)
         number = Vector<Int>(self.adjacencyListOriginal.reservedLength)
         visited = Vector<Bool>(self.adjacencyListOriginal.reservedLength)
-        stack = Vector<Int>()
-        currentStrongConnectedComponents = Vector<Vector<Int>>()
-        
+        stack = Array<Int>()
+        currentStrongConnectedComponents = Array<Array<Int>>()
+
         makeAdjacencyListSubgraph(node: node);
         
         for i in node ..< self.adjacencyListOriginal.reservedLength {
@@ -153,17 +153,17 @@ class StrongConnectedComponents {
         adjacencyList = AdjacencyList(adjacencyListOriginal.reservedLength, 0)
         
         for i in node ..< adjacencyList.reservedLength {
-            let successors = Vector<Int>()
+            var successors = Array<Int>()
             for j in 0 ..< self.adjacencyListOriginal[i].reservedLength {
                 guard let original = adjacencyListOriginal[i]?[j] else { continue }
                 if original >= node {
-                    successors.add(original)
+                    successors.append(original)
                 }
             }
-            if successors.size > 0 {
-                adjacencyList[i] = Vector(successors.size)
-                for j in 0 ..< successors.size {
-                    let succ = successors.get(j)
+            if successors.count > 0 {
+                adjacencyList[i] = Vector(successors.count)
+                for j in 0 ..< successors.count {
+                    let succ = successors[j]
                     adjacencyList[i][j] = succ
                 }
             }
@@ -176,14 +176,14 @@ class StrongConnectedComponents {
      *
      * @return Vector::Integer of the strongConnectedComponents containing the lowest nodenumber
      */
-    private func getLowestIdComponent() -> Vector<Int>? {
+    private func getLowestIdComponent() -> Array<Int>? {
         var min = adjacencyList.reservedLength;
-        var currScc: Vector<Int>?
+        var currScc: Array<Int>?
         
-        for i in 0 ..< currentStrongConnectedComponents.size {
-            let strongConnectedComponents = currentStrongConnectedComponents.get(i)
-            for j in 0 ..< strongConnectedComponents.size {
-                let node = strongConnectedComponents.get(j)
+        for i in 0 ..< currentStrongConnectedComponents.count {
+            let strongConnectedComponents = currentStrongConnectedComponents[i]
+            for j in 0 ..< strongConnectedComponents.count {
+                let node = strongConnectedComponents[j]
                 if node < min {
                     currScc = strongConnectedComponents
                     min = node
@@ -199,14 +199,14 @@ class StrongConnectedComponents {
      * strong connected component with least vertex in the currently viewed
      * subgraph
      */
-    private func getAdjList(nodes: Vector<Int>?) -> AdjacencyList? {
+    private func getAdjList(nodes: Array<Int>?) -> AdjacencyList? {
         guard let nodes = nodes else { return nil }
         let lowestIdAdjacencyList = AdjacencyList(adjacencyList.reservedLength)
         for i in 0 ..< lowestIdAdjacencyList.reservedLength {
             lowestIdAdjacencyList[i] = Vector<Int>()
         }
-        for i in 0 ..< nodes.size {
-            let node = nodes.get(i)
+        for i in 0 ..< nodes.count {
+            let node = nodes[i]
             guard let adjListNode = adjacencyList[node] else { continue }
             for j in 0 ..< adjListNode.reservedLength {
                 guard let succ = adjacencyList[node]?[j] else { continue }
@@ -228,8 +228,8 @@ class StrongConnectedComponents {
         strongConnectedComponentsCounter += 1
         lowlink[root] = strongConnectedComponentsCounter
         number[root] = strongConnectedComponentsCounter
-        visited[root] = true;
-        stack.add(root);
+        visited[root] = true
+        stack.append(root)
         
         for i in 0 ..< adjacencyList[root].reservedLength {
             guard let w = adjacencyList[root]?[i] else { continue }
@@ -244,19 +244,19 @@ class StrongConnectedComponents {
         }
 
         // found strongConnectedComponents
-        if (lowlink[root] == number[root]) && (stack.size > 0) {
+        if (lowlink[root] == number[root]) && (stack.count > 0) {
             var next = -1;
-            let strongConnectedComponents = Vector<Int>()
+            var strongConnectedComponents = Array<Int>()
 
             repeat {
-                next = stack.get(stack.size - 1)
-                stack.remove(at: stack.size - 1)
-                strongConnectedComponents.add(next)
+                guard let popped = stack.popLast() else { break }
+                next = popped
+                strongConnectedComponents.append(next)
             } while number[next]! > number[root]!
 
             // simple scc's with just one node will not be added
-            if strongConnectedComponents.size > 1 {
-                currentStrongConnectedComponents.add(strongConnectedComponents);
+            if strongConnectedComponents.count > 1 {
+                currentStrongConnectedComponents.append(strongConnectedComponents);
             }
         }
     }
diff --git a/Sources/ElementaryCyclesSearch/Public/ElementaryCyclesSearch.swift b/Sources/ElementaryCyclesSearch/Public/ElementaryCyclesSearch.swift
index 8df4bdd..19b2aa5 100644
--- a/Sources/ElementaryCyclesSearch/Public/ElementaryCyclesSearch.swift
+++ b/Sources/ElementaryCyclesSearch/Public/ElementaryCyclesSearch.swift
@@ -42,13 +42,13 @@ import Swift
  */
 public class ElementaryCyclesSearch<Node> {
     /** List of cycles */
-    private var cycles: Vector<Vector<Node>>
+    private var cycles: Array<Array<Node>>
     
     /** Adjacency-list of graph */
     private var adjacencyList: AdjacencyList
     
     /** Graphnodes */
-    private var graphNodes: Vector<Node>
+    private var graphNodes: Array<Node>
     
     /** Blocked nodes, used by the algorithm of Johnson */
     private var blocked: Vector<Bool>
@@ -57,7 +57,7 @@ public class ElementaryCyclesSearch<Node> {
     private var B: Matrix<Int>
     
     /** Stack for nodes, used by the algorithm of Johnson */
-    private var stack: Vector<Int>
+    private var stack: Array<Int>
     
     /**
      * Returns List::List::Object with the Lists of nodes of all elementary
@@ -70,7 +70,7 @@ public class ElementaryCyclesSearch<Node> {
      *
      * @return List::List::Object with the Lists of the elementary cycles.
      */
-    public static func getElementaryCycles(adjacencyMatrix: AdjacencyMatrix, graphNodes: Vector<Node>) -> Vector<Vector<Node>> {
+    public static func getElementaryCycles(adjacencyMatrix: AdjacencyMatrix, graphNodes: Array<Node>) -> Array<Array<Node>> {
         let ecs = ElementaryCyclesSearch(adjacencyMatrix: adjacencyMatrix, graphNodes: graphNodes)
         return ecs.getElementaryCycles()
     }
@@ -83,13 +83,13 @@ public class ElementaryCyclesSearch<Node> {
      * build sets of the elementary cycles containing the objects of the original
      * graph-representation
      */
-    private init(adjacencyMatrix: AdjacencyMatrix, graphNodes: Vector<Node>) {
+    private init(adjacencyMatrix: AdjacencyMatrix, graphNodes: Array<Node>) {
         self.graphNodes = graphNodes;
         self.adjacencyList = AdjacencyList.getAdjacencyList(adjacencyMatrix: adjacencyMatrix)
-        cycles = Vector<Vector<Node>>()
+        cycles = Array<Array<Node>>()
         blocked = Vector<Bool>(adjacencyList.reservedLength)
         B = Matrix<Int>(adjacencyList.reservedLength)
-        stack = Vector<Int>()
+        stack = Array<Int>()
     }
     
     /**
@@ -98,7 +98,7 @@ public class ElementaryCyclesSearch<Node> {
      *
      * @return List::List::Object with the Lists of the elementary cycles.
      */
-    private func getElementaryCycles() -> Vector<Vector<Node>> {
+    private func getElementaryCycles() -> Array<Array<Node>> {
         let sccs = StrongConnectedComponents(adjacencyList: adjacencyList)
         var s = 0
         
@@ -135,20 +135,20 @@ public class ElementaryCyclesSearch<Node> {
      */
     private func findCycles(v: Int, s: Int, adjacencyList: AdjacencyList) -> Bool {
         var f = false
-        stack.add(v)
+        stack.append(v)
         blocked[v] = true
         
         for i in 0 ..< adjacencyList[v].size {
             let w = adjacencyList[v].get(i)
             // found cycle
             if w == s {
-                let cycle = Vector<Node>()
-                for j in 0 ..< stack.size {
-                    let index = stack.get(j)
-                    guard let node = graphNodes[index] else { continue }
-                    cycle.add(node)
+                var cycle = Array<Node>()
+                for j in 0 ..< stack.count {
+                    let index = stack[j]
+                    let node = graphNodes[index] // WARNING guard
+                    cycle.append(node)
                 }
-                cycles.add(cycle)
+                cycles.append(cycle)
                 f = true
             } else if !(blocked[w] ?? false) {
                 if findCycles(v: w, s: s, adjacencyList: adjacencyList) {
@@ -167,8 +167,10 @@ public class ElementaryCyclesSearch<Node> {
                 }
             }
         }
-        
-        stack.remove(element: v)
+
+        if let index = stack.index(of: v) {
+            stack.remove(at: index)
+        }
         return f
     }
     
diff --git a/Sources/ElementaryCyclesSearchExample/main.swift b/Sources/ElementaryCyclesSearchExample/main.swift
index 7be9a83..8a415db 100644
--- a/Sources/ElementaryCyclesSearchExample/main.swift
+++ b/Sources/ElementaryCyclesSearchExample/main.swift
@@ -26,12 +26,12 @@ import ElementaryCyclesSearch
 
 typealias Node = String
 
-private func printCycles(_ cycles: Vector<Vector<Node>>) {
-    for i in 0 ..< cycles.size {
-        let cycle = cycles.get(i)
-        for j in 0 ..< cycle.size {
-            let node = cycle.get(j)
-            if j < (cycle.size - 1) {
+private func printCycles(_ cycles: Array<Array<Node>>) {
+    for i in 0 ..< cycles.count {
+        let cycle = cycles[i]
+        for j in 0 ..< cycle.count {
+            let node = cycle[j]
+            if j < (cycle.count - 1) {
                 print(node + " -> ", terminator: "")
             } else {
                 print(node, terminator: "")
@@ -41,10 +41,10 @@ private func printCycles(_ cycles: Vector<Vector<Node>>) {
     }
 }
 
-let nodes: Vector<Node> = {
-    let vector = Vector<Node>(10)
+let nodes: Array<Node> = {
+    var vector = Array<Node>()
     for i in 0 ..< 10 {
-        vector[i] = "Node \(i)"
+        vector.append("Node \(i)")
     }
     return vector
 }()
diff --git a/Tests/ElementaryCyclesSearchTests/ElementaryCyclesSearchTests.swift b/Tests/ElementaryCyclesSearchTests/ElementaryCyclesSearchTests.swift
index 508200d..4ef3191 100644
--- a/Tests/ElementaryCyclesSearchTests/ElementaryCyclesSearchTests.swift
+++ b/Tests/ElementaryCyclesSearchTests/ElementaryCyclesSearchTests.swift
@@ -6,10 +6,10 @@ final class ElementaryCyclesSearchTests: XCTestCase {
 
     private typealias Node = String
     
-    private var nodes: Vector<Node> {
-        let nodes = Vector<Node>(10)
+    private var nodes: Array<Node> {
+        var nodes = Array<Node>()
         for i in 0 ..< 10 {
-            nodes[i] = "Node \(i)"
+            nodes.append("Node \(i)")
         }
         return nodes
     }
@@ -29,15 +29,15 @@ final class ElementaryCyclesSearchTests: XCTestCase {
         matrix[6][1] = true
     }
     
-    private var sut: ((AdjacencyMatrix, Vector<Node>) -> Vector<Vector<Node>>)!
+    private var sut: ((AdjacencyMatrix, Array<Node>) -> Array<Array<Node>>)!
     
-    private func prettify(cycles: Vector<Vector<Node>>) -> String {
+    private func prettify(cycles: Array<Array<Node>>) -> String {
         var description = ""
-        for i in 0 ..< cycles.size {
-            let cycle = cycles.get(i)
-            for j in 0 ..< cycle.size {
-                let node = cycle.get(j)
-                if j < (cycle.size - 1) {
+        for i in 0 ..< cycles.count {
+            let cycle = cycles[i]
+            for j in 0 ..< cycle.count {
+                let node = cycle[j]
+                if j < (cycle.count - 1) {
                     description.append(node + " -> ")
                 } else {
                     description.append(node)
diff --git a/Tests/ElementaryCyclesTests/ElementaryCyclesSearchShould.swift b/Tests/ElementaryCyclesTests/ElementaryCyclesSearchShould.swift
index 5d6671e..1578903 100644
--- a/Tests/ElementaryCyclesTests/ElementaryCyclesSearchShould.swift
+++ b/Tests/ElementaryCyclesTests/ElementaryCyclesSearchShould.swift
@@ -7,10 +7,10 @@ final class ElementaryCyclesSearchShould: XCTestCase {
 
     private typealias Node = String
     
-    private var nodes: Vector<Node> {
-        let nodes = Vector<Node>(10)
+    private var nodes: Array<Node> {
+        var nodes = Array<Node>()
         for i in 0 ..< 10 {
-            nodes[i] = "Node \(i)"
+            nodes.append("Node \(i)")
         }
         return nodes
     }