Compilare: user.cpp: In function ‘int lookup(int, int)’: user.cpp:16:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define x first ^ user.cpp:50:62: note: in expansion of macro ‘x’ if (i + step < (int)G[n].size() && G[n][i + step] <= x) ^ user.cpp:53:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i >= G[n].size()) ^ user.cpp:16:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define x first ^ user.cpp:56:20: note: in expansion of macro ‘x’ if (G[n][i] != x) ^