Compilare: user.cpp: In function ‘void prefix()’: user.cpp:13: warning: unused variable ‘i’ user.cpp: In function ‘void kmp()’: user.cpp:24: warning: unused variable ‘i’ user.cpp: In function ‘int main()’: user.cpp:49: warning: comparison between signed and unsigned integer expressions user.cpp:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result