Compilare: main.cpp: In function 'void init()': main.cpp:23:14: warning: array subscript has type 'char' [-Wchar-subscripts] ind[c] = p; ^ main.cpp:26:14: warning: array subscript has type 'char' [-Wchar-subscripts] ind[c] = p; ^ main.cpp:29:14: warning: array subscript has type 'char' [-Wchar-subscripts] ind[c] = p; ^ main.cpp: In function 'bool ok(int)': main.cpp:40:40: warning: array subscript has type 'char' [-Wchar-subscripts] h = (1LL * h * sigma + ind[s[i]]) % mod; ^ main.cpp:50:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = value; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:52:53: warning: array subscript has type 'char' [-Wchar-subscripts] h = (1LL * h + mod - (1LL * ind[s[i - value]] * p) % mod) % mod; ^ main.cpp:53:40: warning: array subscript has type 'char' [-Wchar-subscripts] h = (1LL * h * sigma + ind[s[i]]); ^