Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v [aa] . size () ; ++ i) ~~^~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:46:47: warning: suggest parentheses around assignment used as truth value [-Wparentheses] dp [i] = dp2 [i] , mark [i] = dp2 [i] = 0; ~~~~~~~~^~~ user.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < sol . size () ; ++ i) ~~^~~~~~~~~~~~~~~