Compilare: main.cpp: In function 'void init()': main.cpp:25:14: warning: array subscript has type 'char' [-Wchar-subscripts] ind[c] = p; ^ main.cpp:28:14: warning: array subscript has type 'char' [-Wchar-subscripts] ind[c] = p; ^ main.cpp:31:14: warning: array subscript has type 'char' [-Wchar-subscripts] ind[c] = p; ^ main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:35:43: warning: array subscript has type 'char' [-Wchar-subscripts] H[i] = (H[i - 1] * base + ind[s[i]]) % mod; ^ main.cpp: In function 'bool ok(int)': main.cpp:52:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = value; i < s.size(); i++) ~~^~~~~~~~~~ main.cpp:54:45: warning: array subscript has type 'char' [-Wchar-subscripts] h = (h + mod - (p * ind[s[i - value]]) % mod) % mod; ^ main.cpp:55:33: warning: array subscript has type 'char' [-Wchar-subscripts] h = (h * base + ind[s[i]]); ^