Compilare: user.cpp: In function ‘void KMP()’: user.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j<strlen(s)) ^ user.cpp: In function ‘int main()’: user.cpp:70:38: 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); ^ user.cpp:71:40: 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); ^