Compilare: main.cpp: In function 'int get_val(int)': main.cpp:71:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos < v.size() && x > v[pos]) ++pos; ~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:132:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("timetravel.out", "w", stdout); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^