Compilare: user.cpp: In function ‘int dfs(int, int, int)’: user.cpp:68:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:85:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++,printf("\n")) { ^