Compilare: main.cpp: In function 'int convert(int, int)': main.cpp:34:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( size_t j = i ; j < s.size() && j < i + k ; ++ j ) ~~^~~~~~~ main.cpp:36:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( size_t j = i ; j < s.size() && j < i +k ; ++ j ) ~~^~~~~~ main.cpp: In function 'int dei(int, int, int)': main.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^