#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
string A, B;
string subs(string &inp, int x, int y) {
string out = "";
for (int i = x; i <= y; i++) out = out + inp[i];
return out;
}
string stridx(string &inp, int i) {
string out = "" + inp[i];
return out;
}
template<typename Tuple>
string assemble(string &inp, const Tuple &indices) {
string out = "";
std::apply([&](auto... args) {
((out += inp[args]), ...);
}, indices);
return out;
}
void init(string a, string b) {
A = a;
B = b;
}
int get_distance(int x, int y) {
string sa = subs(A, x, y), sb = subs(B, x, y);
if (y - x == 0) {
return sa == sb ? 0 : -1;
}
if (y - x == 1) {
string rb = sb; reverse(rb.begin(), rb.end());
if (sa == sb) return 0;
if (sa == rb) return 1;
else return -1;
}
if (y - x == 2) {
set<string> zero = {sa};
set<string> one = {assemble(sa, make_tuple(0, 2, 1)), assemble(sa, make_tuple(1, 0, 2)), assemble(sa, make_tuple(2, 1, 0))};
set<string> two = {assemble(sa, make_tuple(2, 0, 1)), assemble(sa, make_tuple(1, 2, 0))};
if (zero.count(sb)) return 0;
else if (one.count(sb)) return 1;
else if (two.count(sb)) return 2;
else return -1;
}
return -1;
}
