#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> pre[9];
string ATC = "ATC";
void init(string a, string b) {
int N = a.size();
for (int i = 0; i < 9; i++) {
pre[i] = vector(N + 1, 0);
}
for (int i = 1; i <= N; i++) {
int idx = ATC.find(a[i - 1]) * 3 + ATC.find(b[i - 1]);
for (int j = 0; j < 9; j++) {
pre[j][i] = pre[j][i - 1] + (j == idx);
}
}
}
int get_distance(int x, int y) {
x++, y++;
int arr[9] = {};
for (int i = 0; i < 9; i++) {
arr[i] = pre[i][y] - pre[i][x - 1];
}
int a[3] = {}, b[3] = {};
for (int i = 0; i < 9; i++) {
a[i / 3] += arr[i];
b[i % 3] += arr[i];
}
if (a[0] != b[0] || a[1] != b[1] || a[2] != b[2]) {
return -1;
}
int ret = 0, tmp;
tmp = min(arr[1], arr[3]);
arr[1] -= tmp, arr[3] -= tmp, ret += tmp;
tmp = min(arr[2], arr[6]);
arr[2] -= tmp, arr[6] -= tmp, ret += tmp;
tmp = min(arr[5], arr[7]);
arr[5] -= tmp, arr[7] -= tmp, ret += tmp;
return ret + arr[1] + arr[1];
}
