Compilare: main.cpp: In function 'int main()': main.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A.size(); ++ i, px = (px * 62) % modx, py = (py * 62) % mody) { ~~^~~~~~~~~~ main.cpp:57:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, px = 1, py = 1; i < A.size(); ++ i, px = (px * 62) % modx, py = (py * 62) % mody) { ~~^~~~~~~~~~ main.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = A.size(); i < B.size(); ++ i) { ~~^~~~~~~~~~ main.cpp: In function 'long long int value(char)': main.cpp:38:1: warning: control reaches end of non-void function [-Wreturn-type] } ^