Compilare: user.cpp: In function ‘int main()’: user.cpp:42:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[l][str[l]]--; ^ user.cpp:43:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(dp[l][str[l]] == -1) { ^ user.cpp:44:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[l][str[l]] += MOD; ^ user.cpp:52:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] add(dp[r][str[l]], dp[j % md][1 - str[l - (i - j)]]); ^