Compilare: user.cpp: In function ‘int main()’: user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FORN(i, n) for(int i = 0; i < (n); ++i) ^ user.cpp:89:3: note: in expansion of macro ‘FORN’ FORN(i, g[node].SZ) ^~~~ user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FORN(i, n) for(int i = 0; i < (n); ++i) ^ user.cpp:109:3: note: in expansion of macro ‘FORN’ FORN(j, list1[act].SZ) ^~~~ user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FORN(i, n) for(int i = 0; i < (n); ++i) ^ user.cpp:112:4: note: in expansion of macro ‘FORN’ FORN(k, g[node].SZ) ^~~~ user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FORN(i, n) for(int i = 0; i < (n); ++i) ^ user.cpp:130:2: note: in expansion of macro ‘FORN’ FORN(i, solution.SZ) ^~~~