Compilare: user.cpp: In function ‘void failure()’: user.cpp:12:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < m){ ^ user.cpp: In function ‘void kmp()’: user.cpp:32:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < n; ){ ^ user.cpp:45:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == m){ ^ user.cpp: In function ‘int main()’: user.cpp:61:34: 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:62:36: 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); ^ user.cpp:64:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(p,sizeof(p),stdin); ^ user.cpp:65:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(w,sizeof(w),stdin); ^