Compilare: user.cpp: In function ‘bool BFS()’: user.cpp:68:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[nod].size(); ++i) ^ user.cpp:70:17: warning: unused variable ‘b’ [-Wunused-variable] int b = child; ^ user.cpp: In function ‘void max_flow(int, int)’: user.cpp:105:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[target].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:138:9: warning: unused variable ‘fmax’ [-Wunused-variable] int fmax; ^