Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:121:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%lld", &N); ^ user.cpp:133:29: 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); ^