#include<iostream>
#include<vector>
#include<algorithm>
#define ep emplace
#define eb emplace_back
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long ll;
typedef pair<int,int>pi;
typedef pair<ll,ll>pl;
const int inf=1e9+7;
const ll INF=1e18;
bool chk[200010];
int pa[200010];
int n;
int par(int x)
{
if(!chk[x])
return x;
return pa[x]=par(pa[x]);
}
inline void put(int x)
{
chk[x]=1;
pa[x]=x==1?n:x-1;
return;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int r;
cin>>n>>r;
r=(r-n*2)%n+n*2;
int s;
cin>>s;
vector<int>p(n*2-1);
for(int&t:p)
cin>>t;
if(n<=200)
{
int mx=inf,mi=-1;
for(int i=n;i>0;i--)
{
vector<pi>v(n+1);
for(int j=1;j<i;j++)
v[j]=pi(p[j*2-2],p[j*2-1]);
v[i]=pi(s,p[i*2-2]);
for(int j=i;j++<n;)
v[j]=pi(p[j*2-3],p[j*2-2]);
for(int j=0;j<r;j++)
{
for(int k=1;k++<n;)
if(v[k].fi<v[k].se)
swap(v[k].fi,v[k].se);
if(v[1].fi>v[1].se)
swap(v[1].fi,v[1].se);
for(int k=0;k<n;k++)
v[k].se=v[k+1].se;
v[n].se=v[0].se;
}
int id=-1;
for(int j=0;j++<n;)
if(v[j].fi==s||v[j].se==s)
id=j;
if(id<mx)
mx=id,mi=i;
}
cout<<mi<<endl;
return 0;
}
if(s>1&&s<n+2)
return cout<<n<<endl,0;
int mx=inf,mi=-1;
int ps=-1;
{
int i=n;
vector<pi>v(n+1);
for(int j=1;j<i;j++)
v[j]=pi(p[j*2-2],p[j*2-1]);
v[i]=pi(s,p[i*2-2]);
for(int j=i;j++<n;)
v[j]=pi(p[j*2-3],p[j*2-2]);
vector<int>pos(n*2+1);
for(int j=0;j++<n;)
pos[v[j].fi]=pos[v[j].se]=j;
fill(chk,chk+n+1,0);
if(s!=1)
{
put(pos[1]);
for(int j=n*2;j>s;put(pos[j--]))
pos[j]=par(pos[j]);
pos[s]=par(pos[s]);
}
if(pos[s]<mx)
mx=pos[s],mi=i;
ps=1;
while(chk[ps])
ps++;
}
for(int i=n;i>n-30;i++)
{
vector<pi>v(n+1);
for(int j=1;j<i;j++)
v[j]=pi(p[j*2-2],p[j*2-1]);
v[i]=pi(s,p[i*2-2]);
for(int j=i;j++<n;)
v[j]=pi(p[j*2-3],p[j*2-2]);
vector<int>pos(n*2+1);
for(int j=0;j++<n;)
pos[v[j].fi]=pos[v[j].se]=j;
fill(chk,chk+n+1,0);
if(s!=1)
{
put(pos[1]);
for(int j=n*2;j>s;put(pos[j--]))
pos[j]=par(pos[j]);
pos[s]=par(pos[s]);
}
if(pos[s]<mx)
mx=pos[s],mi=i;
}
for(int i=min(ps+5000000/n,n);i>max(ps-10000000/n,0);i--)
{
vector<pi>v(n+1);
for(int j=1;j<i;j++)
v[j]=pi(p[j*2-2],p[j*2-1]);
v[i]=pi(s,p[i*2-2]);
for(int j=i;j++<n;)
v[j]=pi(p[j*2-3],p[j*2-2]);
vector<int>pos(n*2+1);
for(int j=0;j++<n;)
pos[v[j].fi]=pos[v[j].se]=j;
fill(chk,chk+n+1,0);
if(s!=1)
{
put(pos[1]);
for(int j=n*2;j>s;put(pos[j--]))
pos[j]=par(pos[j]);
pos[s]=par(pos[s]);
}
if(pos[s]<mx)
mx=pos[s],mi=i;
}
cout<<mi<<endl;
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
384 KB |
Output is correct |
| 2 |
Runtime error |
2 ms |
640 KB |
Execution killed with signal 11 |
| 3 |
Correct |
7 ms |
384 KB |
Output is correct |
| 4 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 5 |
Correct |
1 ms |
384 KB |
Output is correct |
| 6 |
Correct |
45 ms |
384 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
57 ms |
384 KB |
Output is correct |
| 3 |
Incorrect |
1 ms |
512 KB |
Output isn't correct |
| 4 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 5 |
Correct |
33 ms |
1664 KB |
Output is correct |
| 6 |
Correct |
43 ms |
384 KB |
Output is correct |
| 7 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 8 |
Incorrect |
3 ms |
512 KB |
Output isn't correct |
| 9 |
Correct |
4 ms |
512 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 11 |
Incorrect |
4 ms |
512 KB |
Output isn't correct |
| 12 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 13 |
Incorrect |
27 ms |
1280 KB |
Output isn't correct |
| 14 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 15 |
Incorrect |
6 ms |
640 KB |
Output isn't correct |
| 16 |
Correct |
58 ms |
384 KB |
Output is correct |
| 17 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 18 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 19 |
Correct |
2 ms |
416 KB |
Output is correct |
| 20 |
Correct |
2 ms |
384 KB |
Output is correct |
| 21 |
Incorrect |
5 ms |
512 KB |
Output isn't correct |
| 22 |
Correct |
7 ms |
640 KB |
Output is correct |
| 23 |
Incorrect |
35 ms |
1696 KB |
Output isn't correct |
| 24 |
Correct |
46 ms |
384 KB |
Output is correct |
| 25 |
Runtime error |
1 ms |
512 KB |
Execution killed with signal 11 |
| 26 |
Runtime error |
2 ms |
768 KB |
Execution killed with signal 11 |
| 27 |
Runtime error |
8 ms |
1384 KB |
Execution killed with signal 11 |
| 28 |
Runtime error |
48 ms |
6004 KB |
Execution killed with signal 11 |
| 29 |
Runtime error |
1 ms |
768 KB |
Execution killed with signal 11 |
| 30 |
Runtime error |
3 ms |
768 KB |
Execution killed with signal 11 |
| 31 |
Runtime error |
7 ms |
1416 KB |
Execution killed with signal 11 |
| 32 |
Runtime error |
63 ms |
7832 KB |
Execution killed with signal 11 |
| 33 |
Correct |
46 ms |
384 KB |
Output is correct |
| 34 |
Correct |
40 ms |
384 KB |
Output is correct |
| 35 |
Runtime error |
2 ms |
640 KB |
Execution killed with signal 11 |
| 36 |
Runtime error |
2 ms |
744 KB |
Execution killed with signal 11 |
| 37 |
Runtime error |
7 ms |
1252 KB |
Execution killed with signal 11 |
| 38 |
Runtime error |
9 ms |
1524 KB |
Execution killed with signal 11 |
| 39 |
Correct |
39 ms |
512 KB |
Output is correct |
| 40 |
Runtime error |
1 ms |
640 KB |
Execution killed with signal 11 |
| 41 |
Runtime error |
2 ms |
640 KB |
Execution killed with signal 11 |
| 42 |
Runtime error |
2 ms |
672 KB |
Execution killed with signal 11 |
| 43 |
Runtime error |
3 ms |
768 KB |
Execution killed with signal 11 |
| 44 |
Runtime error |
4 ms |
968 KB |
Execution killed with signal 11 |
| 45 |
Runtime error |
7 ms |
1288 KB |
Execution killed with signal 11 |
| 46 |
Runtime error |
10 ms |
1488 KB |
Execution killed with signal 11 |
| 47 |
Runtime error |
72 ms |
8588 KB |
Execution killed with signal 11 |
