Compilare: user.cpp: In function ‘void kmp()’: user.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i < D.size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:51:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < S.size(); i++){ ^ user.cpp:63:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < S.size(); i++){ ^