Compilare: user.cpp: In function ‘void readData()’: user.cpp:103:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0, needed = n - 1; needed && j < candidates.size(); ++j) ^ user.cpp: In member function ‘void inputReader::getBuffer()’: user.cpp:28:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, bufferDim, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:137:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &a, &b); ^