Compilare: user.cpp: In function ‘int main()’: user.cpp:69:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] FOR(j, 0, sol[i].sz() - 1) ^ user.cpp:6:42: note: in definition of macro ‘FOR’ #define FOR(i, x, y) for(int i = x; i <= y; ++i) ^ user.cpp:87:30: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << st << ' ' << p - 1; ^