Compilare: user.cpp: In function ‘int cb(int, int)’: user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dr != lista[pos].size()){ ^ user.cpp: In function ‘int main()’: user.cpp:96:15: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] char *c = "cumainilecurate.in"; ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:68:47: 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); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:90:51: 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); ^