#include <dna.h>
#include <bits/stdc++.h>
using namespace std;
vector <int> posa, posb;
void init(string a, string b)
{
int n = a.size();
for (int i = 0; i < n; ++i) {
if (a[i] == 'A') {
posa.push_back(0);
}
else if (a[i] == 'T') {
posa.push_back(1);
}
else if (a[i] == 'C') {
posa.push_back(2);
}
if (b[i] == 'A') {
posb.push_back(0);
}
else if (b[i] == 'T') {
posb.push_back(1);
}
else if (b[i] == 'C') {
posb.push_back(2);
}
}
}
int get_distance(int x, int y)
{
if (y - x == 2) {
bool ok = true;
for (int i = x; i <= y; ++i) {
if (posa[i] != posb[i]) {
ok = false;
break;
}
}
if (ok) {
return 0;
}
int cnta = 0, cntt = 0, cntc = 0;
for (int i = x; i <= y; ++i) {
if (posa[i] == 0) {
cnta++;
}
else if (posa[i] == 1) {
cntt++;
}
else {
cntc++;
}
}
for (int i = x; i <= y; ++i) {
if (posb[i] == 0) {
cnta--;
}
else if (posb[i] == 1) {
cntt--;
}
else {
cntc--;
}
}
if (cnta != 0 or cntt != 0 or cntc != 0) {
return -1;
}
ok = false;
for (int i = x; i <= y; ++i) {
if (posa[i] == posb[i]) {
ok = true;
break;
}
}
if (ok) {
return 1;
}
else {
return 2;
}
}
else if (y - x == 1) {
if (posa[x] == posb[x] and posa[y] == posb[y]) {
return 0;
}
else if (posa[x] == posb[y] and posb[x] == posa[y]) {
return 1;
}
else {
return -1;
}
}
else if (y - x == 0) {
if (posa[x] == posb[x]) {
return 0;
}
else {
return -1;
}
}
else {
int cnta = 0, cntt = 0, cntc = 0;
for (int i = x; i <= y; ++i) {
if (posa[i] == 0) {
cnta++;
}
else if (posa[i] == 2) {
cntc++;
}
else {
cntt++;
}
}
for (int i = x; i <= y; ++i) {
if (posb[i] == 0) {
cnta--;
}
else if (posb[i] == 2) {
cntc--;
}
else {
cntt--;
}
}
if (cnta != 0 or cntt != 0 or cntc != 0) {
return -1;
}
int cnt = 0;
for (int i = x; i <= y; ++i) {
if (posa[i] != posb[i]) {
cnt++;
}
}
int res = (cnt + 1) / 2;
return res;
}
}
