Compilare: main.cpp: In function 'int main()': main.cpp:96:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < P.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'int DtN(char)': main.cpp:44:1: warning: control reaches end of non-void function [-Wreturn-type] } ^