#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) {
map<char,int>m;
map<char,int>m1;
int ans;
int f[A.size()+1];
f[0]=0;
for(int so=0;so<=A.size();so++){f[so]=0;}
for(int so=x;so<=y;so++){
m[A[so]]+=1;
m1[B[so]]+=1;
if(so!=0){f[so]=f[so-1];}
if(A[so]!=B[so]){f[so]+=1;}
}
if(m['A']==m1['A']&&m['T']==m1['T']){
return f[y]-f[x];
m['A']=0;
m['T']=0;
m1['A']=0;
m1['T']=0;
}
else {return -1;
m['A']=0;
m['T']=0;
m1['A']=0;
m1['T']=0;
}
}
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