Compilare: main.cpp: In function 'int main()': main.cpp:18:49: warning: array subscript has type 'char' [-Wchar-subscripts] 18 | for (char c = 'a'; c <= 'z'; c++) sp[i][c] = sp[i-1][c] + (s[i-1] == c); | ^ main.cpp:18:62: warning: array subscript has type 'char' [-Wchar-subscripts] 18 | for (char c = 'a'; c <= 'z'; c++) sp[i][c] = sp[i-1][c] + (s[i-1] == c); | ^ main.cpp:19:49: warning: array subscript has type 'char' [-Wchar-subscripts] 19 | for (char c = 'A'; c <= 'Z'; c++) sp[i][c] = sp[i-1][c] + (s[i-1] == c); | ^ main.cpp:19:62: warning: array subscript has type 'char' [-Wchar-subscripts] 19 | for (char c = 'A'; c <= 'Z'; c++) sp[i][c] = sp[i-1][c] + (s[i-1] == c); | ^ main.cpp:35:37: warning: array subscript has type 'char' [-Wchar-subscripts] 35 | long long t = sp[r + 1][s[r]]; | ^ main.cpp:48:48: warning: array subscript has type 'char' [-Wchar-subscripts] 48 | } else t += (m & 3) * x/2 * (sp[k][c] + sp[k][c ^ 32]); | ^