From 98844eccedfb84fac46c83d59a1298cce491f77b Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Thu, 5 Jan 2017 00:26:34 -0500
Subject: Switch to unordered maps and sets

---
 src/brandes.cc              |  2 +-
 src/dependency_calculator.h | 10 +++++-----
 src/graph.h                 |  9 ++++++---
 3 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/brandes.cc b/src/brandes.cc
index 776b263..5060a9d 100644
--- a/src/brandes.cc
+++ b/src/brandes.cc
@@ -14,7 +14,7 @@ std::string input_file;
 std::string output_file;
 
 Graph graph;
-std::map<int, double> betweenness;
+std::unordered_map<int, double> betweenness;
 std::queue<int> vertices_to_process;
 std::mutex queue_mutex;
 std::mutex betweenness_mutex;
diff --git a/src/dependency_calculator.h b/src/dependency_calculator.h
index 1c77991..be6aeb7 100644
--- a/src/dependency_calculator.h
+++ b/src/dependency_calculator.h
@@ -4,7 +4,7 @@
 #include <stack>
 #include <queue>
 #include <vector>
-#include <map>
+#include <unordered_map>
 
 #include "graph.h"
 
@@ -24,11 +24,11 @@ private:
     const Graph &graph_; // (V, E)
     int vertex_; // s
     std::stack<int> stack_; // S
-    std::map<int, std::vector<int>> shortest_path_predecessors_; // P
-    std::map<int, int> shortest_paths_; // sigma
-    std::map<int, int> distance_; // d
+    std::unordered_map<int, std::vector<int>> shortest_path_predecessors_; // P
+    std::unordered_map<int, int> shortest_paths_; // sigma
+    std::unordered_map<int, int> distance_; // d
     std::queue<int> queue_; // Q
-    std::map<int, double> dependency_; // delta
+    std::unordered_map<int, double> dependency_; // delta
 
     void init_() {
         for (int vertex : graph_.get_vertices()) {
diff --git a/src/graph.h b/src/graph.h
index 7d0ae08..f687ff3 100644
--- a/src/graph.h
+++ b/src/graph.h
@@ -1,7 +1,9 @@
 #ifndef GRAPH_H
 #define GRAPH_H
 
-#include <map>
+#include <algorithm>
+#include <unordered_map>
+#include <unordered_set>
 #include <vector>
 
 class Graph {
@@ -33,10 +35,11 @@ public:
     bool has_out_edges(int vertex) const {
         return has_out_edges_.count(vertex) > 0;
     }
+
 private:
     std::set<int> vertices_;
-    std::map<int, std::vector<int>> graph_;
-    std::set<int> has_out_edges_;
+    std::unordered_map<int, std::vector<int>> graph_;
+    std::unordered_set<int> has_out_edges_;
 };
 
 #endif
-- 
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