This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define sz(x) (int)x.size()
#define int long long
using namespace std;
using ll = long long;
const int maxn = 1e5+5;
string a, b;
int n;
int prefix[3][3][maxn+1];
inline int32_t getHash(char &ch) {
if(ch == 'A') return 0;
if(ch == 'C') return 1;
return 2;
}
void init(string x, string y) {
a = x;
b = y;
n = sz(a);
for(int i=0; i<3; i++)
for(int j=0; j<3; j++)
for(int k=0; k<n; k++)
prefix[i][j][k+1] = prefix[i][j][k] + (getHash(a[k]) == i && getHash(b[k]) == j);
}
int32_t get_distance(int32_t x, int32_t y) {
for(int i=0; i<3; i++) {
int cnt1=0, cnt2=0;
for(int j=0; j<3; j++) {
cnt1 += prefix[i][j][y+1] - prefix[i][j][x];
cnt2 += prefix[j][i][y+1] - prefix[j][i][x];
}
if(cnt1 != cnt2) return -1;
}
int ans1 = 0, ans2 = 0;
int v[3][3];
for(int i=0; i<3; i++)
for(int j=0; j<3; j++)
v[i][j] = prefix[i][j][y+1] - prefix[i][j][x];
for(int i=0; i<3; i++) {
for(int j=i+1; j<3; j++) {
if(v[i][j] < v[j][i]) swap(v[i][j], v[j][i]);
ans2 += v[i][j] - v[j][i];
ans1 += v[j][i];
}
}
return ans1 + ans2 / 3 * 2;
}
// int32_t main() {
// int n, q;
// cin >> n >> q;
// string x, y;
// cin >> x >> y;
// init(x, y);
// while(q--) {
// int l, r;
// cin >> l >> r;
// cout << get_distance(l, r) << '\n';
// }
// return 0;
// }
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