#include "dna.h"
#include <bits/stdc++.h>
using namespace std;
map<char, int> mp;
string a, b;
void init(std::string _a, std::string _b) {
a = _a;
b = _b;
mp['A'] = 0;
mp['T'] = 1;
mp['C'] = 2;
}
int get_distance(int x, int y) {
vector<vector<int>> d1(3), d2(3);
for (int i = x; i <= y; ++i) {
d1[mp[a[i]]].push_back(i);
d2[mp[b[i]]].push_back(i);
}
int res = 0;
for (int i = 0; i < 3; ++i) {
auto& v1 = d1[i];
auto& v2 = d2[i];
if (v1.size() != v2.size()) return -1;
set<int> st;
for (auto& u : v1) st.insert(u);
for (auto& u : v2) {
if (st.count(u)) continue;
res += 1;
}
}
// cerr << "[" << a.substr(x, y - x + 1) << " , " << b.substr(x, y - x + 1) << "] = " << res << "\n";
// assert(res % 2 == 0);
return res - 1;
}
