Compilare: main.cpp: In function 'void solve(long long unsigned int)': main.cpp:69:16: warning: array subscript has type 'char' [-Wchar-subscripts] 69 | frecv *= f[c]; | ^ main.cpp:70:27: warning: array subscript has type 'char' [-Wchar-subscripts] 70 | frecv += f_s[loc - 1][c]; | ^ main.cpp: In function 'int main()': main.cpp:114:15: warning: array subscript has type 'char' [-Wchar-subscripts] 114 | f[c] ++; | ^ main.cpp:115:20: warning: array subscript has type 'char' [-Wchar-subscripts] 115 | f_s[j][c] ++; | ^