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Detect cycle in a directed graph #1717

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Detect cycle in a directed graph #1717

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29 changes: 29 additions & 0 deletions Detect-cycle-in-a-directed-graph.cpp
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Original file line number Diff line number Diff line change
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class Solution
{ public:
bool dfsCycle(int i,vector<int>adj[],int vis[],int dfsVis[]){
vis[i]=1;
dfsVis[i]=1;
for(auto u :adj[i]){
if(!vis[u]){
if(dfsCycle(u,adj,vis,dfsVis))return true;
}
else if(dfsVis[u])return true;
}
dfsVis[i]=0;
return false;
}
public:
//Function to detect cycle in a directed graph.
bool isCyclic(int V, vector<int> adj[])
{
int vis[V];
int dfsVis[V];
memset(vis,0,sizeof(vis));
memset(dfsVis,0,sizeof(dfsVis));
for(int i=0;i<V;i++){
if(!vis[i])
if(dfsCycle(i,adj,vis,dfsVis))return true;
}
return false;
}
};