Compilare: main.cpp: In function 'int main()': main.cpp:23:18: warning: array subscript has type 'char' [-Wchar-subscripts] 23 | f[i][s[i]]++; | ^ main.cpp:31:80: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | dp[flag][dim] = dp[old_flag][dim - 1] + ((i - dim + 1) - (f[i][s[i]] - f[dim - 1][s[i]])); | ^ main.cpp:31:99: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | dp[flag][dim] = dp[old_flag][dim - 1] + ((i - dim + 1) - (f[i][s[i]] - f[dim - 1][s[i]])); | ^