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Submission #987090

# Submission time Handle Problem Language Result Execution time Memory
987090 2024-05-21T20:41:25 Z Pyqe Thousands Islands (IOI22_islands) C++17
55 / 100
 44 ms 30040 KB 
#include <bits/stdc++.h>
#include "islands.h"

using namespace std;

#define mp make_pair
#define fr first
#define sc second

const long long inf=1e18;
long long n,m,nn=0,nn2[2],nn3[2],cnn,dh[100069],an[100069],cyc[100069],ex[100069],ex2[2][100069],ex3[2][100069],cex[100069];
vector<pair<long long,long long>> al[100069],nx[100069],nx2[100069];
vector<long long> vl[100069];
bitset<100069> vtd,vtd2;
pair<long long,long long> pr[100069];
bitset<200069> spc[2];

void dfs(long long x)
{
	long long i,j,sz=al[x].size(),sz2,k,l,p;
	
	vtd[x]=1;
	vtd2[x]=1;
	for(i=0;i<sz;i++)
	{
		l=al[x][i].fr;
		p=al[x][i].sc;
		if(!vtd[l])
		{
			dh[l]=dh[x]+1;
			pr[l]={x,p};
			dfs(l);
		}
		if(vtd2[l])
		{
			if(dh[l]>dh[an[x]]&&!cyc[x])
			{
				an[x]=l;
				nx[x]={{l,p}};
			}
		}
		else
		{
			if(cyc[l])
			{
				if(!cyc[x])
				{
					nx[x].clear();
				}
				nx2[x].push_back({l,p});
			}
			cyc[x]=min(cyc[x]+cyc[l],2ll);
			if(vl[x].empty())
			{
				if(dh[an[l]]>dh[an[x]]&&!cyc[x])
				{
					an[x]=an[l];
					nx[x]={{l,p}};
				}
			}
			else
			{
				if(!cyc[l])
				{
					if(!cyc[x])
					{
						nx[x].clear();
					}
					cyc[x]=min(cyc[x]+1,2ll);
					nx[x].push_back({l,p});
				}
				sz2=vl[x].size();
				for(j=0;j<sz2;j++)
				{
					k=vl[x][j];
					cyc[k]=max(cyc[k],1ll);
				}
				vl[x].clear();
			}
		}
	}
	vtd2[x]=0;
	if(vtd2[an[x]]&&!cyc[x])
	{
		vl[an[x]].push_back(x);
	}
}

variant<bool,vector<int>> find_journey(int on,int om,vector<int> ka,vector<int> la)
{
	long long i,ii,k,l,p,sz,e,kk,ll,rt=0;
	pair<long long,long long> mne={inf,-1};
	vector<int> sq;
	
	n=on;
	m=om;
	for(i=1;i<=m;i++)
	{
		k=ka[i-1]+1;
		l=la[i-1]+1;
		al[k].push_back({l,i});
	}
	dh[0]=-1;
	dfs(1);
	if(cyc[1]!=2)
	{
		return false;
	}
	for(i=1;i<=n;i++)
	{
		if(cyc[i]==2&&dh[i]>dh[rt])
		{
			rt=i;
		}
	}
	for(k=rt;k!=1;k=pr[k].fr)
	{
		p=pr[k].sc;
		nn++;
		ex[nn]=p;
	}
	reverse(ex+1,ex+nn+1);
	for(ii=0;ii<2;ii++)
	{
		for(k=rt;!nx2[k].empty();k=l)
		{
			l=nx2[k].back().fr;
			p=nx2[k].back().sc;
			nx2[k].pop_back();
			nn2[ii]++;
			ex2[ii][nn2[ii]]=p;
		}
		kk=k;
		for(;1;k=l)
		{
			l=nx[k][0].fr;
			p=nx[k][0].sc;
			nn3[ii]++;
			ex3[ii][nn3[ii]]=p;
			if(l==an[k])
			{
				break;
			}
		}
		ll=l;
		cnn=0;
		for(k=kk;k!=ll;k=pr[k].fr)
		{
			p=pr[k].sc;
			cnn++;
			cex[cnn]=p;
		}
		reverse(cex+1,cex+cnn+1);
		for(i=1;i<=cnn;i++)
		{
			nn3[ii]++;
			ex3[ii][nn3[ii]]=cex[i];
		}
		for(i=1;i<=n;i++)
		{
			reverse(nx[i].begin(),nx[i].end());
		}
		mne=min(mne,{dh[ll],ii});
	}
	for(ii=0;ii<2;ii++)
	{
		for(i=1;i<=nn3[ii];i++)
		{
			k=ex3[ii][i];
			spc[ii][k]=1;
		}
	}
	for(i=1;i<=nn3[1];i++)
	{
		k=ex3[1][i];
		if(!spc[0][k])
		{
			break;
		}
	}
	if(nn3[0]==nn3[1]&&i>nn3[0])
	{
		for(i=1;i<=nn;i++)
		{
			sq.push_back(ex[i]);
		}
		for(i=1;i<=nn2[0];i++)
		{
			sq.push_back(ex2[0][i]);
		}
		for(i=1;i<=nn3[0];i++)
		{
			sq.push_back(ex3[0][i]);
		}
		for(i=nn2[0];i;i--)
		{
			sq.push_back(ex2[0][i]);
		}
		for(i=1;i<=nn2[1];i++)
		{
			sq.push_back(ex2[1][i]);
		}
		for(i=nn3[1];i;i--)
		{
			sq.push_back(ex3[1][i]);
		}
		for(i=nn2[1];i;i--)
		{
			sq.push_back(ex2[1][i]);
		}
		for(i=nn;i;i--)
		{
			sq.push_back(ex[i]);
		}
	}
	else
	{
		for(i=1;i<=nn3[1];i++)
		{
			k=ex3[1][i];
			if(spc[0][k])
			{
				break;
			}
		}
		if(i<=nn3[1])
		{
			e=mne.sc;
			for(i=1;i<=nn;i++)
			{
				sq.push_back(ex[i]);
			}
			for(i=1;i<=nn2[!e];i++)
			{
				sq.push_back(ex2[!e][i]);
			}
			for(i=1;i<=nn3[!e];i++)
			{
				sq.push_back(ex3[!e][i]);
			}
			for(i=nn2[!e];i;i--)
			{
				sq.push_back(ex2[!e][i]);
			}
			for(i=1;i<=nn2[e];i++)
			{
				sq.push_back(ex2[e][i]);
			}
			for(i=1;i<=nn3[e];i++)
			{
				k=ex3[e][i];
				if(spc[!e][k])
				{
					break;
				}
				sq.push_back(k);
			}
			kk=i;
			for(i=1;ex3[!e][i]!=k;i++);
			for(i=(i+nn3[!e]-2)%nn3[!e]+1;1;i=(i+nn3[!e]-2)%nn3[!e]+1)
			{
				k=ex3[!e][i];
				if(spc[e][k])
				{
					break;
				}
				sq.push_back(k);
			}
			for(i=kk;i<=nn3[e];i++)
			{
				k=ex3[e][i];
				if(!spc[!e][k])
				{
					sq.push_back(k);
				}
			}
			for(i=nn2[e];i;i--)
			{
				sq.push_back(ex2[e][i]);
			}
			for(i=1;i<=nn2[!e];i++)
			{
				k=ex2[!e][i];
				if(spc[e][k])
				{
					break;
				}
				sq.push_back(k);
			}
			if(i<=nn2[!e])
			{
				kk=k;
			}
			else
			{
				kk=ex3[!e][1];
			}
			for(i=1;ex3[e][i]!=kk;i++);
			for(i=(i+nn3[e]-2)%nn3[e]+1;1;i=(i+nn3[e]-2)%nn3[e]+1)
			{
				k=ex3[e][i];
				sq.push_back(k);
				if(k==kk)
				{
					break;
				}
			}
			for(i=nn2[!e];i;i--)
			{
				k=ex2[!e][i];
				if(!spc[e][k])
				{
					sq.push_back(k);
				}
			}
			for(i=nn;i;i--)
			{
				sq.push_back(ex[i]);
			}
		}
		else
		{
			for(i=1;i<=nn;i++)
			{
				sq.push_back(ex[i]);
			}
			for(i=1;i<=nn2[0];i++)
			{
				sq.push_back(ex2[0][i]);
			}
			for(i=1;i<=nn3[0];i++)
			{
				sq.push_back(ex3[0][i]);
			}
			for(i=nn2[0];i;i--)
			{
				sq.push_back(ex2[0][i]);
			}
			for(i=1;i<=nn2[1];i++)
			{
				sq.push_back(ex2[1][i]);
			}
			for(i=1;i<=nn3[1];i++)
			{
				sq.push_back(ex3[1][i]);
			}
			for(i=nn2[1];i;i--)
			{
				sq.push_back(ex2[1][i]);
			}
			for(i=1;i<=nn2[0];i++)
			{
				sq.push_back(ex2[0][i]);
			}
			for(i=nn3[0];i;i--)
			{
				sq.push_back(ex3[0][i]);
			}
			for(i=nn2[0];i;i--)
			{
				sq.push_back(ex2[0][i]);
			}
			for(i=1;i<=nn2[1];i++)
			{
				sq.push_back(ex2[1][i]);
			}
			for(i=nn3[1];i;i--)
			{
				sq.push_back(ex3[1][i]);
			}
			for(i=nn2[1];i;i--)
			{
				sq.push_back(ex2[1][i]);
			}
			for(i=nn;i;i--)
			{
				sq.push_back(ex[i]);
			}
		}
	}
	sz=sq.size();
	for(i=0;i<sz;i++)
	{
		sq[i]--;
	}
	return sq;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 12632 KB Output is correct
2 Correct 4 ms 14684 KB Output is correct
3 Correct 4 ms 12636 KB Output is correct
4 Correct 3 ms 12636 KB Output is correct
5 Correct 3 ms 12636 KB Output is correct
6 Correct 3 ms 14684 KB Output is correct
7 Correct 38 ms 22744 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 14684 KB Output is correct
2 Correct 4 ms 12636 KB Output is correct
3 Correct 3 ms 14680 KB Output is correct
4 Correct 3 ms 14684 KB Output is correct
5 Correct 4 ms 14684 KB Output is correct
6 Correct 31 ms 22448 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15196 KB Output is correct
2 Correct 3 ms 12636 KB Output is correct
3 Correct 4 ms 12636 KB Output is correct
4 Correct 4 ms 14684 KB Output is correct
5 Correct 4 ms 12888 KB Output is correct
6 Correct 4 ms 14836 KB Output is correct
7 Correct 3 ms 12888 KB Output is correct
8 Correct 4 ms 14788 KB Output is correct
9 Correct 5 ms 14800 KB Output is correct
10 Correct 4 ms 14940 KB Output is correct
11 Correct 5 ms 14680 KB Output is correct
12 Correct 5 ms 15196 KB Output is correct
13 Correct 4 ms 12636 KB Output is correct
14 Correct 3 ms 12636 KB Output is correct
15 Correct 4 ms 14684 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 23 ms 19804 KB Output is correct
18 Correct 19 ms 19292 KB Output is correct
19 Correct 3 ms 12636 KB Output is correct
20 Correct 4 ms 14680 KB Output is correct
21 Correct 3 ms 14684 KB Output is correct
22 Correct 5 ms 14684 KB Output is correct
23 Correct 32 ms 22356 KB Output is correct

Subtask #4
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 14684 KB Output is correct
2 Correct 5 ms 14940 KB Output is correct
3 Correct 31 ms 21296 KB Output is correct
4 Correct 33 ms 21840 KB Output is correct
5 Correct 4 ms 14940 KB Output is correct
6 Correct 6 ms 14940 KB Output is correct
7 Correct 4 ms 14684 KB Output is correct
8 Correct 4 ms 14684 KB Output is correct
9 Correct 5 ms 14684 KB Output is correct
10 Correct 5 ms 14940 KB Output is correct
11 Correct 4 ms 12892 KB Output is correct
12 Correct 5 ms 14940 KB Output is correct
13 Correct 6 ms 15196 KB Output is correct
14 Correct 4 ms 14940 KB Output is correct
15 Correct 5 ms 14940 KB Output is correct
16 Correct 4 ms 14940 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct
18 Correct 4 ms 14940 KB Output is correct
19 Correct 5 ms 14936 KB Output is correct
20 Correct 33 ms 20060 KB Output is correct
21 Correct 32 ms 21580 KB Output is correct
22 Correct 4 ms 12888 KB Output is correct
23 Correct 3 ms 12636 KB Output is correct
24 Correct 3 ms 12636 KB Output is correct
25 Correct 3 ms 14684 KB Output is correct
26 Correct 5 ms 14940 KB Output is correct
27 Correct 34 ms 22692 KB Output is correct
28 Correct 35 ms 22752 KB Output is correct
29 Correct 4 ms 12636 KB Output is correct
30 Correct 35 ms 21252 KB Output is correct
31 Correct 3 ms 14680 KB Output is correct
32 Correct 34 ms 22444 KB Output is correct
33 Correct 32 ms 21920 KB Output is correct
34 Correct 22 ms 19792 KB Output is correct
35 Correct 5 ms 14940 KB Output is correct
36 Correct 30 ms 21340 KB Output is correct
37 Correct 35 ms 24272 KB Output is correct
38 Correct 3 ms 12632 KB Output is correct
39 Correct 28 ms 19084 KB Output is correct
40 Correct 5 ms 14936 KB Output is correct
41 Correct 36 ms 20960 KB Output is correct
42 Correct 37 ms 22608 KB Output is correct
43 Correct 3 ms 12632 KB Output is correct
44 Correct 3 ms 12892 KB Output is correct
45 Correct 6 ms 14936 KB Output is correct
46 Correct 17 ms 19036 KB Output is correct

Subtask #5
0.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 12632 KB Output is correct
2 Correct 4 ms 14684 KB Output is correct
3 Correct 4 ms 12636 KB Output is correct
4 Correct 3 ms 12636 KB Output is correct
5 Correct 3 ms 12636 KB Output is correct
6 Correct 3 ms 14684 KB Output is correct
7 Correct 38 ms 22744 KB Output is correct
8 Correct 3 ms 14684 KB Output is correct
9 Correct 4 ms 12636 KB Output is correct
10 Correct 3 ms 14680 KB Output is correct
11 Correct 3 ms 14684 KB Output is correct
12 Correct 4 ms 14684 KB Output is correct
13 Correct 31 ms 22448 KB Output is correct
14 Correct 5 ms 15196 KB Output is correct
15 Correct 3 ms 12636 KB Output is correct
16 Correct 4 ms 12636 KB Output is correct
17 Correct 4 ms 14684 KB Output is correct
18 Correct 4 ms 12888 KB Output is correct
19 Correct 4 ms 14836 KB Output is correct
20 Correct 3 ms 12888 KB Output is correct
21 Correct 4 ms 14788 KB Output is correct
22 Correct 5 ms 14800 KB Output is correct
23 Correct 4 ms 14940 KB Output is correct
24 Correct 5 ms 14680 KB Output is correct
25 Correct 5 ms 15196 KB Output is correct
26 Correct 4 ms 12636 KB Output is correct
27 Correct 3 ms 12636 KB Output is correct
28 Correct 4 ms 14684 KB Output is correct
29 Correct 4 ms 12636 KB Output is correct
30 Correct 23 ms 19804 KB Output is correct
31 Correct 19 ms 19292 KB Output is correct
32 Correct 3 ms 12636 KB Output is correct
33 Correct 4 ms 14680 KB Output is correct
34 Correct 3 ms 14684 KB Output is correct
35 Correct 5 ms 14684 KB Output is correct
36 Correct 32 ms 22356 KB Output is correct
37 Correct 3 ms 14684 KB Output is correct
38 Correct 4 ms 12632 KB Output is correct
39 Correct 3 ms 12632 KB Output is correct
40 Correct 4 ms 12636 KB Output is correct
41 Correct 16 ms 15964 KB Output is correct
42 Correct 5 ms 12892 KB Output is correct
43 Correct 40 ms 26832 KB Output is correct
44 Correct 44 ms 23748 KB Output is correct
45 Correct 40 ms 29388 KB Output is correct
46 Correct 4 ms 14684 KB Output is correct
47 Correct 4 ms 14684 KB Output is correct
48 Correct 4 ms 14684 KB Output is correct
49 Runtime error 15 ms 30040 KB Execution killed with signal 11
50 Halted 0 ms 0 KB -