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