Compilare: user.cpp: In function ‘void prefix()’: user.cpp:11: 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:42: warning: format ‘%s’ expects type ‘char*’, but argument 2 has type ‘char (*)[2000001]’ user.cpp:43: warning: format ‘%s’ expects type ‘char*’, but argument 2 has type ‘char (*)[2000001]’ user.cpp:49: warning: comparison between signed and unsigned integer expressions user.cpp:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result