#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
string a,b;
void init(std::string A, std::string B) {
    a=A;
    b=B;
}
int get_distance(int x, int y) {
    string suba= a.substr(x, y);
    string subb= b.substr(x, y);
    int sol=0;
    for(int i=x;i<=y;i++){
        if(a[i]!=b[i]){
            sol++;
            
        }
    }
    sort(suba.begin(), suba.end());
    sort(subb.begin(), subb.end());
    if(subb!=suba){
        return -1;
    }
    sol=sol/2+1;
	return sol;
}
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