Compilare: user.cpp: In function ‘void Read()’: user.cpp:33:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%s", &str[1]); ^ user.cpp: In function ‘void Prefix()’: user.cpp:47:21: warning: array subscript is below array bounds [-Warray-bounds] k = pi[k]; ^ user.cpp: In function ‘void KMP()’: user.cpp:67:21: warning: array subscript is below array bounds [-Warray-bounds] k = pi[k]; ^