Compilare: user.cpp: In function ‘int main()’: user.cpp:75:71: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] val = min(val, cap[father[node]][node] - flow[father[node]][node]); ^ user.cpp:8:25: note: in definition of macro ‘min’ #define min(x, y) ((x < y) ? x : y) ^ user.cpp:80:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] val = min(val, cap[G[n][i]][n] - flow[G[n][i]][n]); ^ user.cpp:8:25: note: in definition of macro ‘min’ #define min(x, y) ((x < y) ? x : y) ^