Compilare: main.cpp: In function 'int main()': main.cpp:20:38: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | ans = (ans + (((sum - sp[s[i]]) % MOD) * (n - i)) % MOD); | ^ main.cpp:21:16: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | sp[s[i]] = sp[s[i]] + i + 1; | ^ main.cpp:21:27: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | sp[s[i]] = sp[s[i]] + i + 1; | ^