Compilare: user.cpp: In function ‘void kmp_search(const char*, const char*, int)’: user.cpp:9:17: warning: variable ‘result’ set but not used [-Wunused-but-set-variable] const char *result = NULL; ^ user.cpp: In function ‘int main()’: user.cpp:52:15: warning: unused variable ‘a’ [-Wunused-variable] long long a,b; ^ user.cpp:52:17: warning: unused variable ‘b’ [-Wunused-variable] long long a,b; ^ user.cpp:50:36: 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); ^ user.cpp:51:38: 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); ^