1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
vector<pair<ll,ll>> W;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    ll n , k , s;
    cin>> n >> k >> s;
    ll a , b;
    ll cs =0 ;
    ll odp = 0 ;
    ll oldcs=1000000000000000;
    W.pb({0,0});
    for(int i = 1 ; i<=k ; ++i)
    {
      cin >> a >> b;
      W.pb({a,b});
    }
    sort(W.begin(),W.end());
    W.pb({n+1,1000000000000000});
    /*for( auto it : W)
        cout << it.first << " " << it.second << " ";*/
   for( int i = 1 ; i <= k ; ++i)
   {
        if(W[i].first-W[i-1].second>1)
       {
           cs = abs((W[i].first-1)-s);
           if(cs<oldcs)
            odp = W[i].first - 1;
           //cout << " cs1 " <<  cs<<" ";

       oldcs = cs;}
       if(W[i+1].first-W[i].second>1)
       {cs = abs((W[i].second+1)-s);
       if(cs<oldcs)
        odp = W[i].second+1;
        //cout << " cs " <<  cs<<" ";

       oldcs=cs;}


   }
   cout << odp;
    return 0;
}