Compilare: main.cpp: In function 'int main()': main.cpp:28:45: warning: unused variable 'sol' [-Wunused-variable] int t , ii , i , start , a , b , c , n ,sol ; ^~~ main.cpp:29:10: warning: unused variable 'flag' [-Wunused-variable] bool flag; ^~~~ main.cpp:51:20: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(start) ; ^