Compilare: main.cpp: In function 'void getP()': main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < a.length(); i++) { ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < b.length(); i++) { ~~^~~~~~~~~~~~ main.cpp:36:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == a.length()-1) { ~~^~~~~~~~~~~~~~~