Compilare: user.cpp: In function ‘int main()’: user.cpp:94:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v.size();++i) ^ user.cpp:95:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=i+1;j<v.size();++j) ^ user.cpp:86:9: warning: unused variable ‘dogsleft’ [-Wunused-variable] int dogsleft = n; ^ user.cpp:87:15: warning: unused variable ‘aranj’ [-Wunused-variable] long long aranj = 1; ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:34:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:12:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^