Compilare: main.cpp: In function 'void kmp(std::__cxx11::string, std::__cxx11::string, vii&)': main.cpp:3:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define REP(i, a, b) for (int i = a; i < b; i++) main.cpp:17:6: REP(s_i, 0, s.size()) { ~~~~~~~~~~~~~~~~ main.cpp:17:2: note: in expansion of macro 'REP' REP(s_i, 0, s.size()) { ^~~ main.cpp:29:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (w_i == w.size()) { ~~~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:40:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ main.cpp:41:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^