#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
string a;
string b;
void init(std::string c, std::string d) {
a=c;
b=d;
}
int get_distance(int x, int y) {
int a1=0, a2=0, t1=0, t2=0;
int mv=0;
for (int i=x;i<=y;i++){
if (a[i]=='A') a1++;
else t1++;
if (b[i]=='A') a2++;
else t2++;
if (a[i]!=b[i]) mv++;
}
if (a1!=a2 || t1!=t2){
return -1;
}
return mv/2;
return 0;
}
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