Compilare: user.cpp: In function ‘int main()’: user.cpp:67:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it = 0 ; it < sol . size () ; ++ it) ~~~^~~~~~~~~~~~~~~ user.cpp:28:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (cin , "%s" , pat + 1); ^ user.cpp:29:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (cin , "%s" , v + 1); ^ user.cpp:58:47: warning: ‘z’ may be used uninitialized in this function [-Wmaybe-uninitialized] val2 = 1LL * ((val2 + mod) - 1LL * (z * code (v [p1]) % mod)); ~~^~~~~~~~~~~~~~~