#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-x+1);
string subb= b.substr(x, y-x+1);
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;
sol=sol/2+1;
return sol;
}
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