#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
string s1,s2;
void init(std::string a, std::string b) {
s1 = a;
s2 = b;
}
int get_distance(int x, int y) {
int a1=0, a2=0, wrong=0;
for(int i=x;i<=y;i++)
{
if(s1[i]=='A') a1++;
if(s2[i]=='A') a2++;
if(s1[i]!=s2[i]) wrong++;
}
if(a1!=a2) return -1;
else return wrong/2;
}
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