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- #include <iostream>
- #include <bits/stdc++.h>
- using namespace std;
- int main(){
- int t;
- cin>>t;
- while (t--){
- int n , s, k;
- cin>>n >>s>>k;
- set<long long > ss;
- int x;
- for(int i=0;i<k;i++){
- cin>>x;
- ss.insert(x);
- }
- long long i=s;
- long long ans=0;
- while (i<=n){
- if(!ss.count(i)){
- ans=i-s;
- break;
- }
- i++;
- }
- i=s;
- while (i>0){
- if(!ss.count(i)){
- ans=min(ans,s-i);
- break;
- }
- i--;
- }
- cout<<ans<<endl;
- }
- return 0;
- }
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