Compilare: user.cpp: In function ‘long long int sol2(int, long long int, char, int)’: user.cpp:43:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] return frecv[n][abs(c)]; ^ user.cpp:44:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] return frecv[n][abs(rev(c))]; ^ user.cpp:46:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long norm=frecv[k][abs(c)]; ^ user.cpp:47:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long inv=frecv[k][abs(rev(c))]; ^ user.cpp: In function ‘int main()’: user.cpp:82:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] frecv[i][abs(c)]++; ^ user.cpp:75:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d ",&k,&q); ^ user.cpp:85:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%lld",&n); ^