Compilare: main.cpp: In function 'int main()': main.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<sol.size();j++) ~^~~~~~~~~~~ main.cpp:105:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ~^~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:15:29: 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); ^