Compilare: user.cpp: In function ‘int main()’: user.cpp:31:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = x; j <= y; j += s) ^ user.cpp:30:7: warning: unused variable ‘i’ [-Wunused-variable] int i = sscanf((char*)&ss[0], "%lu%lu%lu%lu", &x, &y, &s, &g); ^ user.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= n; i++) ^ user.cpp:24:6: warning: unused variable ‘ij’ [-Wunused-variable] int ij = sscanf((char*)&contents[0], "%lu%lu", &n, &m); ^