Compilare: main.cpp: In function 'int32_t main()': main.cpp:18:40: warning: array subscript has type 'char' [-Wchar-subscripts] 18 | r+=((long long)(t-c[s[i]]) * (n-i))%mod; | ~~~^ main.cpp:22:22: warning: array subscript has type 'char' [-Wchar-subscripts] 22 | c[s[i]]+=i+1; | ~~~^ main.cpp:23:22: warning: array subscript has type 'char' [-Wchar-subscripts] 23 | c[s[i]]%=mod; | ~~~^