#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) {
    string suba= a.substr(x, y);
    string subb= b.substr(x, y);
    int sol=0;
    int Aa=0;
    int Ab=0;
    int Ta=0;
    int Tb=0;
    int Ca=0;
    int Cb=0;
    for(int i=0;i<=x-y;i++){
        if(suba[i]=='A') Aa++;
        if(suba[i]=='T')Ta++;
        if(suba[i]=='C')Ca++;
        if(subb[i]=='A')Ab++;
        if(subb[i]=='T')Tb++;
        if(subb[i]=='C')Cb++;
        if(suba[i]!=subb[i]) sol++;
        
    }
    if(Aa!=Ab or Ta!=Tb or Ca!=Cb){
        return -1;
    }
	return sol/2+1;
}
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