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/*
Normal graph routine
*/
void dfs(int v, int parent)
{
	visited[v] = 1;
 
	rep(i, 0, SZ(g[v]))
	{
		if(!visited[g[v][i]])
			dfs(g[v][i], v);
		else if(g[v][i] != parent)
		{
			hasCycle = true;
			return;
		}
	}
}
 
/*
 
calling dfs
*/
for(int i=0;i<n;i++)
{
	if(!visited[i])
	{
	 dfs(i, -1);            //->this line why do people start with -1 even after knowing the fact that -1 can't be there
	 if(hasCycle)
		break;
	}
}

prog.cpp: In function 'void dfs(int, int)':
prog.cpp:6:2: error: 'visited' was not declared in this scope
  visited[v] = 1;
  ^
prog.cpp:8:6: error: 'i' was not declared in this scope
  rep(i, 0, SZ(g[v]))
      ^
prog.cpp:8:15: error: 'g' was not declared in this scope
  rep(i, 0, SZ(g[v]))
               ^
prog.cpp:8:19: error: 'SZ' was not declared in this scope
  rep(i, 0, SZ(g[v]))
                   ^
prog.cpp:8:20: error: 'rep' was not declared in this scope
  rep(i, 0, SZ(g[v]))
                    ^
prog.cpp: At global scope:
prog.cpp:24:1: error: expected unqualified-id before 'for'
 for(int i=0;i<n;i++)
 ^
prog.cpp:24:13: error: 'i' does not name a type
 for(int i=0;i<n;i++)
             ^
prog.cpp:24:17: error: 'i' does not name a type
 for(int i=0;i<n;i++)
                 ^

Standard output is empty