Compilare: main.cpp: In function 'int main()': main.cpp:15:85: warning: array subscript has type 'char' [-Wchar-subscripts] rez = ((long long)rez + 1LL * ((s.size() - i + mod) % mod) * ((tot - ma[s[i]] + mod) % mod)) % mod; ^ main.cpp:17:16: warning: array subscript has type 'char' [-Wchar-subscripts] ma[s[i]] = ((long long)ma[s[i]] + i + 1) % mod; ^ main.cpp:17:39: warning: array subscript has type 'char' [-Wchar-subscripts] ma[s[i]] = ((long long)ma[s[i]] + i + 1) % mod; ^