Compilare: user.cpp: In function ‘void df(int, int, int)’: user.cpp:147:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:203:28: note: in expansion of macro ‘sz’ for (i = 0; i < vec2[k].sz; ++i) ^ user.cpp: In function ‘void df2(int)’: user.cpp:147:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define sz size() ^ user.cpp:216:27: note: in expansion of macro ‘sz’ for (i = 0; i < vec[k].sz; ++i) ^ user.cpp: In function ‘void solve()’: user.cpp:238:19: warning: unused variable ‘nod2’ [-Wunused-variable] int i, j, nod, nod2; ^