Compilare: main.cpp: In function 'int main()': main.cpp:152:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int q = 0; q < v[j].size(); ++q) ~~^~~~~~~~~~~~~ main.cpp:165:19: warning: unused variable 'c' [-Wunused-variable] int a, b, c; ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:13:29: 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); ^