Compilare: user.cpp: In function ‘int main()’: user.cpp:125:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<bcc.size(); ++i) ^ user.cpp: In function ‘void read(int&)’: user.cpp:21:71: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos == buf_size) pos = 0, fread(buffer, 1, buf_size, stdin); ^ user.cpp:29:71: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos == buf_size) pos = 0, fread(buffer, 1, buf_size, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:97:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("santa.in", "r", stdin); ^ user.cpp:98:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("santa.out", "w", stdout); ^ user.cpp:100:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos = 0, fread(buffer, 1, buf_size, stdin); ^