#include "dna.h"
#include "bits/stdc++.h"
using namespace std;
string s, s2;
void init(string a, string b){
s = a, s2 = b;
}
int get_distance(int x, int y){
if(y - x <= 2){
int s_a = 0, s_c = 0, s_t = 0;
int s2_a = 0, s2_c = 0, s2_t = 0;
for(int i = x; i <= y; ++i){
s_a += (s[i] == 'A');
s_c += (s[i] == 'C');
s_t += (s[i] == 'T');
s2_a += (s2[i] == 'A');
s2_c += (s2[i] == 'C');
s2_t += (s2[i] == 'T');
}
if(s_a != s2_a or s_c != s2_c or s_t != s2_t)
return -1;
int ok = 1;
for(int i = x; i <= y; ++i)
ok &= (s[i] == s2[i]);
if(ok)
return 0;
int ans = 0;
for(int i = x; i <= y; ++i)
ans += (s[i] != s2[i]);
ans--;
return ans;
}
// galan wagt dine 'A' we 'T' harplar bar
int ans = 0;
int s_a = 0, s_t = 0;
int s2_a = 0, s2_t = 0;
for(int i = x; i <= y; ++i){
s_a += (s[i] == 'A');
s_t += (s[i] == 'T');
s2_a += (s2[i] == 'A');
s2_t += (s2[i] == 'T');
}
if(s_a != s2_a or s_t != s2_t)
return -1;
for(int i = x; i <= y; ++i)
ans += (s[i] != s2[i]);
ans >>= 1;
return ans;
}
