Compilare: user.cpp: In function ‘int cb(std::vector<int>&, int)’: user.cpp:142:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (step = 1; step < v.size(); step <<= 1); ^ user.cpp:144:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + step < v.size() && v[i + step] <= x) ^ user.cpp: In function ‘int main()’: user.cpp:201:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short int i=1;i<verifx.size();++i){ ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:89:51: 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:39:47: 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); ^