Compilare: main.cpp: In function 'long long int calctot(std::vector<int>&, std::vector<int>&, std::vector<int>&)': main.cpp:82:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:19:31: 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, 100000, fin); ^