Compilare: user.cpp: In function ‘int hash(char*)’: user.cpp:37:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < strlen(S); i ++) { ^ user.cpp: In function ‘void read()’: user.cpp:17:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", B); ^ user.cpp: In function ‘int main(int, const char**)’: user.cpp:121:54: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitepatternmatching.in", "r", stdin); ^ user.cpp:122:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitepatternmatching.out", "w", stdout); ^