From 2e5c68a54e8d83c70830d8a78a15e9f175ad95fe Mon Sep 17 00:00:00 2001
From: Gpamangkp <41160734+Gpamangkp@users.noreply.github.com>
Date: Wed, 21 Oct 2020 11:09:48 +0530
Subject: [PATCH] included referenced variable to avoid repitition

---
 graph/breadth_first_search.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/graph/breadth_first_search.cpp b/graph/breadth_first_search.cpp
index f6846e00e..2553efc72 100644
--- a/graph/breadth_first_search.cpp
+++ b/graph/breadth_first_search.cpp
@@ -87,9 +87,9 @@ class Graph{
     std::map<T,bool> breadth_first_search(T src){
       std::map<T,bool> tracker;
 
-      for(auto const adjlist: adjacency_list){
+      for(auto const &adjlist: adjacency_list){
         tracker[adjlist.first]=false;
-        for(auto const node:adjacency_list[adjlist.first]){
+        for(auto const &node:adjacency_list[adjlist.first]){
           tracker[node]=false;
         }
       }
@@ -99,7 +99,7 @@ class Graph{
       while(!q.empty()){
         T node = q.front();
         q.pop();
-        for(T const neighbour : adjacency_list[node]){
+        for(T const &neighbour : adjacency_list[node]){
           if(!tracker[neighbour]){
             q.push(neighbour);
             tracker[neighbour]=true;