Compilare: main.cpp: In function 'int main()': main.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < A.size(); ++ i, px = (px * 52) % modx, py = (py * 52) % mody) { ~~^~~~~~~~~~ main.cpp:55:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, px = 1, py = 1; i < A.size(); ++ i, px = (px * 52) % modx, py = (py * 52) % mody) { ~~^~~~~~~~~~ main.cpp:68:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = A.size(); i < B.size(); ++ i) { ~~^~~~~~~~~~