Compilare: main.cpp: In function 'void calculatePrefix()': main.cpp:13:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < A.size(); ++i) { ~~^~~~~~~~~~ main.cpp: In function 'int countMatches()': main.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < B.size(); ++i) { ~~^~~~~~~~~~ main.cpp:32:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p == A.size() - 1) { ~~^~~~~~~~~~~~~~~