#include <bits/stdc++.h>
using namespace std;
int dis[100005];
string A, B;
void init(string a, string b){
A = a;
B = b;
}
int get_distance(int x, int y){
int c1[26]{},c2[26]{};
for(int i = x; i <= y; i++) c1[A[i]-'A']++;
for(int i = x; i <= y; i++) c2[B[i]-'A']++;
for(int i = 0; i < 26; i++) if(c1[i]!=c2[i]) return -1;
string a = A.substr(x,y-x+1), b = B.substr(x,y-x+1);
int cnt = 0;
for(int i = 0; i < a.length(); i++){
if(a[i]==b[i]) continue;
for(int j = i+1; j < b.length(); j++){
if(a[i]==b[j]){
cnt++;
swap(b[i],b[j]);
break;
}
}
}return cnt;
}
// int main(){
// int n, q; cin >> n >> q;
// string s1, s2; cin >> s1 >> s2;
// init(s1,s2);
// while(q--){
// int x, y; cin >> x >> y;
// cout << get_distance(x,y) << endl;
// }
// }
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