From efd2e396247fbdc662b1efd473ec66273b8d003e Mon Sep 17 00:00:00 2001
From: Zarif <zarif98sjs@gmail.com>
Date: Sun, 15 Aug 2021 20:07:41 +0600
Subject: [PATCH] some modification

---
 .vscode/c_cpp_properties.json             | 19 +++++++++
 Algorithm/02 DFS.cpp                      | 25 ++++++------
 Algorithm/07 Prim's MST.cpp               | 49 +++++------------------
 Algorithm/08 Kruskal's MST.cpp            | 32 +--------------
 Algorithm/38 Subtree Size.cpp             | 31 --------------
 Algorithm/40 Cycle Check.cpp              | 20 ---------
 Algorithm/41 Cycle Check Directed.cpp     | 27 -------------
 Algorithm/41.2 Cycle Check Directed 2.cpp | 27 -------------
 8 files changed, 42 insertions(+), 188 deletions(-)
 create mode 100644 .vscode/c_cpp_properties.json

diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..50d7bb7
--- /dev/null
+++ b/.vscode/c_cpp_properties.json
@@ -0,0 +1,19 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "windowsSdkVersion": "10.0.16299.0",
+            "compilerPath": "C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/VC/Tools/MSVC/14.29.30037/bin/Hostx64/x64/cl.exe",
+            "intelliSenseMode": "windows-msvc-x64"
+        }
+    ],
+    "version": 4
+}
\ No newline at end of file
diff --git a/Algorithm/02 DFS.cpp b/Algorithm/02 DFS.cpp
index 319f7dd..8dd1f00 100644
--- a/Algorithm/02 DFS.cpp	
+++ b/Algorithm/02 DFS.cpp	
@@ -49,22 +49,23 @@ inline void optimizeIO()
 const int nmax = 2e5+7;
 const LL LINF = 1e17;
 
-string to_str(LL x)
-{
-    stringstream ss;
-    ss<<x;
-    return ss.str();
-}
-
-//bool cmp(const PII &A,const PII &B)
-//{
-//
-//}
-
 vector<int>adj[nmax];
 vector<bool>vis(nmax,false);
 vector<int>dist(nmax,0);
 
+/**
+ * 
+ * For tree, it is sufficient to only keep track of parent
+ * 
+ * void dfs(int u,int p)
+ * {
+ *      for(int v:adj[u])      
+ *          if(v != p)
+ *              dfs(v,u); 
+ * }
+ * 
+ **/
+
 void dfs(int u)
 {
     vis[u] = true;
diff --git a/Algorithm/07 Prim's MST.cpp b/Algorithm/07 Prim's MST.cpp
index a4dcc79..65fedd5 100644
--- a/Algorithm/07 Prim's MST.cpp	
+++ b/Algorithm/07 Prim's MST.cpp	
@@ -24,25 +24,6 @@ using namespace std;
 #define ALL(x) (x).begin(), (x).end()
 #define DBG(x) cerr << __LINE__ << " says: " << #x << " = " << (x) << endl
 
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-using namespace __gnu_pbds;
-
-template<class TIn>
-using indexed_set = tree<
-                    TIn, null_type, less<TIn>,
-                    rb_tree_tag, tree_order_statistics_node_update>;
-
-/*
-PBDS
--------------------------------------------------
-1) insert(value)
-2) erase(value)
-3) order_of_key(value) // 0 based indexing
-4) *find_by_order(position) // 0 based indexing
-
-*/
-
 inline void optimizeIO()
 {
     ios_base::sync_with_stdio(false);
@@ -52,18 +33,6 @@ inline void optimizeIO()
 const int nmax = 1e3+7;
 const LL LINF = 1e17;
 
-string to_str(LL x)
-{
-    stringstream ss;
-    ss<<x;
-    return ss.str();
-}
-
-//bool cmp(const PII &A,const PII &B)
-//{
-//
-//}
-
 int nodes,edges;
 
 vector<PII>adj[nmax];
@@ -71,11 +40,11 @@ vector<PII>adj[nmax];
 LL MinST(int src = 1) /** n vertices , 1 based indexing **/
 {
     priority_queue< PII,vector<PII>,greater <PII> >PQ;
-    vector<bool> inMinST(nmax, false);
-    vector<PII> parent(nmax,{-1,0});
+    vector<bool>inMinST(nmax, false);
+    vector<PII>parent(nmax,{-1,0});
     vector<int>min_d(nmax,INF); /** For maximum spanning tree , USE max_d(nmax,0) **/
 
-    min_d[src]=0;
+    min_d[src] = 0;
     PQ.push({0,src});
 
     while(!PQ.empty())
@@ -83,18 +52,18 @@ LL MinST(int src = 1) /** n vertices , 1 based indexing **/
         int now=PQ.top().S;
         PQ.pop();
 
-        inMinST[now]=true;
+        inMinST[now] = true;
 
         for(auto x:adj[now])
         {
-            int next=x.F;
-            int weight=x.S;
+            int next = x.F;
+            int weight = x.S;
 
-            if(inMinST[next]==false && weight<min_d[next]) /** For maximum spanning tree ,  weight>max_d[next] **/
+            if(inMinST[next] == false && weight < min_d[next]) /** For maximum spanning tree ,  weight>max_d[next] **/
             {
-                min_d[next]=weight;
+                min_d[next] = weight;
                 PQ.push(MP(min_d[next],next));
-                parent[next]=MP(now,min_d[next]);
+                parent[next] = MP(now,min_d[next]);
             }
         }
     }
diff --git a/Algorithm/08 Kruskal's MST.cpp b/Algorithm/08 Kruskal's MST.cpp
index bdf98cd..f1c1a83 100644
--- a/Algorithm/08 Kruskal's MST.cpp	
+++ b/Algorithm/08 Kruskal's MST.cpp	
@@ -24,25 +24,6 @@ using namespace std;
 #define ALL(x) (x).begin(), (x).end()
 #define DBG(x) cerr << __LINE__ << " says: " << #x << " = " << (x) << endl
 
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-using namespace __gnu_pbds;
-
-template<class TIn>
-using indexed_set = tree<
-                    TIn, null_type, less<TIn>,
-                    rb_tree_tag, tree_order_statistics_node_update>;
-
-/*
-PBDS
--------------------------------------------------
-1) insert(value)
-2) erase(value)
-3) order_of_key(value) // 0 based indexing
-4) *find_by_order(position) // 0 based indexing
-
-*/
-
 inline void optimizeIO()
 {
     ios_base::sync_with_stdio(false);
@@ -52,17 +33,6 @@ inline void optimizeIO()
 const int nmax = 1e3+7;
 const LL LINF = 1e17;
 
-string to_str(LL x)
-{
-    stringstream ss;
-    ss<<x;
-    return ss.str();
-}
-
-//bool cmp(const PII &A,const PII &B)
-//{
-//
-//}
 
 struct Edge {
 	int src, dest, weight;
@@ -102,7 +72,7 @@ class DisjointSet
 		if (parent[k] == k)
 			return k;
 
-		return parent[k] =Find(parent[k]);
+		return parent[k] = Find(parent[k]);
 	}
 
 	void Union(int a, int b)
diff --git a/Algorithm/38 Subtree Size.cpp b/Algorithm/38 Subtree Size.cpp
index 0413cdd..0723611 100644
--- a/Algorithm/38 Subtree Size.cpp	
+++ b/Algorithm/38 Subtree Size.cpp	
@@ -21,25 +21,6 @@ using namespace std;
 #define ALL(x) (x).begin(), (x).end()
 #define DBG(x) cerr << __LINE__ << " says: " << #x << " = " << (x) << endl
 
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-using namespace __gnu_pbds;
-
-template<class TIn>
-using indexed_set = tree<
-                    TIn, null_type, less<TIn>,
-                    rb_tree_tag, tree_order_statistics_node_update>;
-
-/*
-PBDS
--------------------------------------------------
-1) insert(value)
-2) erase(value)
-3) order_of_key(value) // 0 based indexing
-4) *find_by_order(position) // 0 based indexing
-
-*/
-
 inline void optimizeIO()
 {
     ios_base::sync_with_stdio(false);
@@ -49,18 +30,6 @@ inline void optimizeIO()
 const int nmax = 2e5+7;
 const LL LINF = 1e17;
 
-string to_str(LL x)
-{
-    stringstream ss;
-    ss<<x;
-    return ss.str();
-}
-
-//bool cmp(const PII &A,const PII &B)
-//{
-//
-//}
-
 vector<int>adj[nmax];
 int sub[nmax]; /** subtree size **/
 
diff --git a/Algorithm/40 Cycle Check.cpp b/Algorithm/40 Cycle Check.cpp
index bb3d104..fb53e71 100644
--- a/Algorithm/40 Cycle Check.cpp	
+++ b/Algorithm/40 Cycle Check.cpp	
@@ -31,26 +31,6 @@ using namespace std;
 #define ALL(x) (x).begin(), (x).end()
 #define DBG(x) cerr << __LINE__ << " says: " << #x << " = " << (x) << endl
 
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-using namespace __gnu_pbds;
-
-template<class TIn>
-using indexed_set = tree<
-                    TIn, null_type, less<TIn>,
-                    rb_tree_tag, tree_order_statistics_node_update>;
-
-/**
-
-PBDS
--------------------------------------------------
-1) insert(value)
-2) erase(value)
-3) order_of_key(value) // 0 based indexing
-4) *find_by_order(position) // 0 based indexing
-
-**/
-
 inline void optimizeIO()
 {
     ios_base::sync_with_stdio(false);
diff --git a/Algorithm/41 Cycle Check Directed.cpp b/Algorithm/41 Cycle Check Directed.cpp
index 01820e8..e294645 100644
--- a/Algorithm/41 Cycle Check Directed.cpp	
+++ b/Algorithm/41 Cycle Check Directed.cpp	
@@ -30,26 +30,6 @@ using namespace std;
 #define ALL(x) (x).begin(), (x).end()
 #define DBG(x) cerr << __LINE__ << " says: " << #x << " = " << (x) << endl
 
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-using namespace __gnu_pbds;
-
-template<class TIn>
-using indexed_set = tree<
-                    TIn, null_type, less<TIn>,
-                    rb_tree_tag, tree_order_statistics_node_update>;
-
-/**
-
-PBDS
--------------------------------------------------
-1) insert(value)
-2) erase(value)
-3) order_of_key(value) // 0 based indexing
-4) *find_by_order(position) // 0 based indexing
-
-**/
-
 inline void optimizeIO()
 {
     ios_base::sync_with_stdio(false);
@@ -59,13 +39,6 @@ inline void optimizeIO()
 const int nmax = 2e5+7;
 const LL LINF = 1e17;
 
-string to_str(LL x)
-{
-    stringstream ss;
-    ss<<x;
-    return ss.str();
-}
-
 vector<int>adj[nmax];
 vector<int>col(nmax,0);
 
diff --git a/Algorithm/41.2 Cycle Check Directed 2.cpp b/Algorithm/41.2 Cycle Check Directed 2.cpp
index 517a7f7..440af23 100644
--- a/Algorithm/41.2 Cycle Check Directed 2.cpp	
+++ b/Algorithm/41.2 Cycle Check Directed 2.cpp	
@@ -40,26 +40,6 @@ using namespace std;
 #define ALL(x) (x).begin(), (x).end()
 #define DBG(x) cerr << __LINE__ << " says: " << #x << " = " << (x) << endl
 
-#include <ext/pb_ds/assoc_container.hpp>
-#include <ext/pb_ds/tree_policy.hpp>
-using namespace __gnu_pbds;
-
-template<class TIn>
-using indexed_set = tree<
-                    TIn, null_type, less<TIn>,
-                    rb_tree_tag, tree_order_statistics_node_update>;
-
-/**
-
-PBDS
--------------------------------------------------
-1) insert(value)
-2) erase(value)
-3) order_of_key(value) // 0 based indexing
-4) *find_by_order(position) // 0 based indexing
-
-**/
-
 inline void optimizeIO()
 {
     ios_base::sync_with_stdio(false);
@@ -69,13 +49,6 @@ inline void optimizeIO()
 const int nmax = 2e5+7;
 const LL LINF = 1e17;
 
-string to_str(LL x)
-{
-    stringstream ss;
-    ss<<x;
-    return ss.str();
-}
-
 vector<vector<int>>adj;
 
 vector<bool>vis;