Compilare: main.cpp: In function 'int main()': main.cpp:55:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < v.size() ; i++ ) ~~^~~~~~~~~~ main.cpp:28:45: warning: variable 'sol' set but not used [-Wunused-but-set-variable] int t , ii , i , start , a , b , c , n ,sol ; ^~~ main.cpp:53:20: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(start) ; ^