Compilare: user.cpp: In function ‘bool BF()’: user.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:40:32: note: in expansion of macro ‘sz’ for (j = 0; j < G[nod].sz; j++) ^ user.cpp: In function ‘int main()’: user.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:69:30: note: in expansion of macro ‘sz’ for (i = 0; i < G[N].sz; i++) ^ user.cpp:56:24: warning: unused variable ‘h’ [-Wunused-variable] int i, flow, fmin, h, x, y, z, nod; ^