From 52f777e625a945bc43afeeaaffa4d77cc264c5ab Mon Sep 17 00:00:00 2001
From: Guilherme Werner <guilherme.werner@tribufu.com>
Date: Sat, 17 Jun 2023 16:10:47 -0300
Subject: [PATCH] Brute force fail

---
 Source/Graph.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 Source/Graph.h   |  3 +++
 Source/Main.cpp  |  7 +++++--
 3 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/Source/Graph.cpp b/Source/Graph.cpp
index 47bd6d3..666a436 100644
--- a/Source/Graph.cpp
+++ b/Source/Graph.cpp
@@ -156,3 +156,42 @@ void Graph::TransitiveClosure()
         cout << "\n";
     }
 }
+
+void Graph::PrintPermutations(const vector<int> &array)
+{
+    for (const auto &permutation : array)
+    {
+        cout << permutation << " ";
+    }
+
+    cout << endl;
+}
+
+void Graph::PermuteArray(vector<int> &array, int start)
+{
+    if (start == array.size() - 1)
+    {
+        PrintPermutations(array);
+    }
+    else
+    {
+        for (int i = start; i < array.size(); i++)
+        {
+            swap(array[start], array[i]);
+            this->PermuteArray(array, start + 1);
+            swap(array[start], array[i]);
+        }
+    }
+}
+
+void Graph::Permute()
+{
+    std::vector<int> vertices;
+
+    for (int i = 0; i < length; i++)
+    {
+        vertices[i] = i;
+    }
+
+    this->PermuteArray(vertices, 0);
+}
diff --git a/Source/Graph.h b/Source/Graph.h
index ac495ad..2886b43 100644
--- a/Source/Graph.h
+++ b/Source/Graph.h
@@ -37,9 +37,12 @@ public:
     void Remove(int u, int v);
     void RemoveD(int u, int v);
     void TransitiveClosure();
+    void Permute();
     Graph *Clone();
 
 private:
     void DFS(int u, vector<int> &disc, vector<int> &low, vector<int> &parent, vector<pair<int, int>> &bridge);
     int DFSCount(int v, bool visited[]);
+    void PrintPermutations(const std::vector<int> &array);
+    void PermuteArray(std::vector<int> &array, int start);
 };
diff --git a/Source/Main.cpp b/Source/Main.cpp
index 9eb2e5a..3e8865e 100644
--- a/Source/Main.cpp
+++ b/Source/Main.cpp
@@ -11,8 +11,11 @@ int main()
     g1->InsertD(2, 0);
     g1->InsertD(2, 3);
 
-    cout << "-- TRANSITIVE CLOSURE --\n\n";
-    g1->TransitiveClosure();
+    cout << "-- PERMUTATIONS --\n\n";
+    g1->Permute();
+
+    //cout << "-- TRANSITIVE CLOSURE --\n\n";
+    //g1->TransitiveClosure();
 
     return 0;
 }