Compilare: main.cpp: In function 'int main()': main.cpp:27:31: warning: array subscript has type 'char' [-Wchar-subscripts] h = (h * 62 + cod[a[n]]) % P; ^ main.cpp:28:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (n < strlen(a) - 1) pw = pw * 62 % P; ~~^~~~~~~~~~~~~~~ main.cpp:35:34: warning: array subscript has type 'char' [-Wchar-subscripts] h1 = (h1 * 62 + cod[b[i]]) % P; ^ main.cpp:39:33: warning: array subscript has type 'char' [-Wchar-subscripts] h1 = ((h1 - cod[b[i - n]] * pw % P + P) * 62 + cod[b[i]]) % P; ^ main.cpp:39:64: warning: array subscript has type 'char' [-Wchar-subscripts] h1 = ((h1 - cod[b[i - n]] * pw % P + P) * 62 + cod[b[i]]) % P; ^