Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:138:6: warning: variable ‘VMAX1’ set but not used [-Wunused-but-set-variable] int VMAX1; ^ user.cpp:136:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%lld", &N); ^ user.cpp:152:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(bufi, 1, 2000000, fi); ^