Create EventualSafeStates.cpp

Graphs/EventualSafeStates.cpp

@@ -0,0 +1,47 @@
+class Solution {
+    private:
+     bool dfs(int node, vector<int>&vis,vector<vector<int>>& graph, vector<int>&pathVis, vector<int>&check){
+        vis[node]=1;
+        pathVis[node]=1;
+        check[node]=0;
+        for(auto it:graph[node]){
+            if(!vis[it]){
+                if(dfs(it,vis,graph,pathVis,check)==true){
+                    check[node]=0;
+                    return true;
+                }
+            }
+            else if(pathVis[it]){
+                check[node]=0;
+                return true;
+            }
+        }
+        check[node]=1;
+        pathVis[node]=0;
+        return false;
+
+    }
+public:
+    vector<int> eventualSafeNodes(vector<vector<int>>& graph) {
+        int V=graph.size();
+
+        vector<int>vis(V,0);
+        vector<int>pathVis(V,0);
+        vector<int>check(V,0);
+        vector<int>safe;
+
+        for(int i=0;i<V;i++){
+            if(!vis[i]){
+                dfs(i,vis,graph,pathVis,check);
+
+                }
+            }
+
+        for(int i=0;i<V;i++){
+            if(check[i]==1){
+                safe.push_back(i);
+            }
+        }
+        return safe;
+    }
+};