simple dfs code.... why is it not working? please help input : 6 1 1 6 1 2 2 3 2 5 3 4 4 5 code : http://pastebin.com/EazYw5af my code run properly when I remove printf which is out of for loop in dfs function. If I write printf function... it does not work... strange..
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Because It's underfined behaviour. printf("%d %d\n",x,visited[G[x][k]]); At this line, k = G[x].size() because of end of loop.
It is not working when prinf is inside the loop outside the if statement. for(k=0; k<G[x].size(); k++) { if(visited[G[x][k]]==0) { visited[G[x][k]]=1;
int v=G[x][k]; // cout<<v<<endl; dfs(v); } printf("%d %d\n",x,visited[G[x][k]]); }Make 'k' not global. Also don't use global variables at all.
In real world programming using global variables is bad. But in competitive programming it usually improves working time of the solution and can be crucial. So I am not sure, if "don't use global variables at all" is good advice for competitive programming.