#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) {
string a1;
string b2;
int t_c = 0;
int a_c = 0;
int a_t = 0;
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;
a1 = a.substr(x,y-x+1);
b2 = b.substr(x,y-x+1);
for(int i = 0;i < a1.length();i++){
if(a1[i] == 'T'){
t_count++;
}
if(a1[i] == 'A'){
a_count++;
}
if(b2[i] == 'T'){
t_count2++;
}
if(b2[i] == 'A'){
a_count2++;
}
if(a1[i] == 'C'){
c_count++;
}
if(b2[i] == 'C'){
c_count2++;
}
if((a1[i] == 'T' && b2[i] == 'C') || (a1[i] == 'C' && b2[i] == 'T')){
t_c++;
}
if((a1[i] == 'T' && b2[i] == 'A') || (a1[i] == 'A' && b2[i] == 'T')){
a_c++;
}
if((a1[i] == 'A' && b2[i] == 'C') || (a1[i] == 'C' && b2[i] == 'A')){
a_t++;
}
}
if((t_count != t_count2) || (a_count != a_count2) || (c_count != c_count2)){
return -1;
}
else{
bool w = false;
bool q = false;
bool e = false;
if(a_t % 2 == 0){
a_t /= 2;
w = true;
}
if(a_c % 2 == 0){
a_c /= 2;
q = true;
}
if(t_c % 2 == 0){
t_c /= 2;
e = true;
}
if((w && q) && e){
return a_c + a_t + t_c;
}
return a_c + a_t + t_c - 1;
}
}
