#include "dna.h"
#include<bits/stdc++.h>
using namespace std;
string a;
string b;
void init(string n, string m) {
a = n;
b = m;
}
int get_distance(int x, int y) {
int ans = 0;
int c_count = 0;
int t_count = 0;
int a_count = 0;
int t_count2 = 0;
int a_count2 = 0;
int c_count2 = 0;
a = a.substr(x,y-x);
b = b.substr(x,y-x);
for(int i = 0;i < a.length();i++){
if(a[i] == 'T'){
t_count++;
}
if(a[i] == 'A'){
a_count++;
}
if(b[i] == 'T'){
t_count2++;
}
if(b[i] == 'A'){
a_count2++;
}
if(a[i] == 'C'){
c_count++;
}
if(b[i] == 'C'){
c_count2++;
}
if(a[i] != b[i]){
ans++;
}
}
if((t_count != t_count2) || (a_count != a_count2) || (c_count != c_count2)){
return -1;
}
else if(c_count == 0){
return ans/2;
}
else{
return ans/2;
}
}
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