Compilare: user.cpp: In function ‘char query(i64, i64, bool)’: user.cpp:26:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] ant+= sum[pos][str[pos]]; ^ user.cpp:33:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] ant+= 3 * ((sum[n - 1][ch] + sum[n - 1][ch ^ 'a' ^ 'A']) * (len / 8)); ^ user.cpp:35:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] ant+= sum[n - 1][ch] + 2 * sum[n - 1][ch ^ 'a' ^ 'A']; ^ user.cpp:41:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] ant+= 2 * ((sum[n - 1][ch] + sum[n - 1][ch ^ 'a' ^ 'A']) * (len / 8)); ^ user.cpp:43:24: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] ant+= sum[n - 1][ch - 'a' ^ 'A'] + sum[n - 1][ch ^ 'a' ^ 'A']; ^ user.cpp:48:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] ant+= (sum[n - 1][ch] + sum[n - 1][ch ^ 'a' ^ 'A']) * (len / 8); ^ user.cpp:50:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] ant+= sum[n - 1][ch]; ^