#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
string a, b;
void init(string aa, string bb) {
a = aa; b = bb;
}
int get_distance(int x, int y) {
if (x == y) {
if (a[x] == b[x]) return 0;
return -1;
}
if (a[x] == b[x] && a[y] == b[y]) return 0;
if (a[x] == b[y] && a[y] == b[x]) return 1;
return -1;
}
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