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Submission #987085

# Submission time Handle Problem Language Result Execution time Memory
987085 2024-05-21T20:25:51 Z Pyqe Thousands Islands (IOI22_islands) C++17
55 / 100
 49 ms 30044 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
		{
			cyc[x]=min(cyc[x]+cyc[l],2ll);
			if(cyc[l])
			{
				nx2[x].push_back({l,p});
			}
			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]])
	{
		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 3 ms 12632 KB Output is correct
2 Correct 5 ms 14680 KB Output is correct
3 Correct 3 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 5 ms 14684 KB Output is correct
7 Correct 35 ms 22760 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 14680 KB Output is correct
2 Correct 4 ms 12724 KB Output is correct
3 Correct 4 ms 14680 KB Output is correct
4 Correct 3 ms 14684 KB Output is correct
5 Correct 5 ms 14684 KB Output is correct
6 Correct 30 ms 22460 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 15192 KB Output is correct
2 Correct 4 ms 12632 KB Output is correct
3 Correct 3 ms 12888 KB Output is correct
4 Correct 5 ms 14684 KB Output is correct
5 Correct 4 ms 12892 KB Output is correct
6 Correct 4 ms 14684 KB Output is correct
7 Correct 4 ms 12832 KB Output is correct
8 Correct 4 ms 14680 KB Output is correct
9 Correct 5 ms 14680 KB Output is correct
10 Correct 4 ms 15196 KB Output is correct
11 Correct 5 ms 14684 KB Output is correct
12 Correct 5 ms 15196 KB Output is correct
13 Correct 4 ms 12736 KB Output is correct
14 Correct 4 ms 12636 KB Output is correct
15 Correct 3 ms 14684 KB Output is correct
16 Correct 3 ms 12632 KB Output is correct
17 Correct 24 ms 19776 KB Output is correct
18 Correct 20 ms 19292 KB Output is correct
19 Correct 3 ms 12636 KB Output is correct
20 Correct 3 ms 14684 KB Output is correct
21 Correct 3 ms 14680 KB Output is correct
22 Correct 3 ms 14684 KB Output is correct
23 Correct 31 ms 22364 KB Output is correct

Subtask #4
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 14680 KB Output is correct
2 Correct 5 ms 14940 KB Output is correct
3 Correct 31 ms 21340 KB Output is correct
4 Correct 31 ms 21836 KB Output is correct
5 Correct 5 ms 14936 KB Output is correct
6 Correct 5 ms 14940 KB Output is correct
7 Correct 4 ms 14684 KB Output is correct
8 Correct 3 ms 14680 KB Output is correct
9 Correct 3 ms 14680 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 15032 KB Output is correct
13 Correct 5 ms 15452 KB Output is correct
14 Correct 5 ms 14936 KB Output is correct
15 Correct 5 ms 14936 KB Output is correct
16 Correct 5 ms 14936 KB Output is correct
17 Correct 3 ms 12636 KB Output is correct
18 Correct 6 ms 14940 KB Output is correct
19 Correct 5 ms 14956 KB Output is correct
20 Correct 34 ms 20060 KB Output is correct
21 Correct 34 ms 21588 KB Output is correct
22 Correct 4 ms 12888 KB Output is correct
23 Correct 4 ms 12636 KB Output is correct
24 Correct 3 ms 12632 KB Output is correct
25 Correct 5 ms 14772 KB Output is correct
26 Correct 4 ms 15348 KB Output is correct
27 Correct 37 ms 22612 KB Output is correct
28 Correct 34 ms 22612 KB Output is correct
29 Correct 3 ms 12636 KB Output is correct
30 Correct 35 ms 21084 KB Output is correct
31 Correct 3 ms 14684 KB Output is correct
32 Correct 35 ms 22360 KB Output is correct
33 Correct 32 ms 21764 KB Output is correct
34 Correct 22 ms 19800 KB Output is correct
35 Correct 5 ms 14940 KB Output is correct
36 Correct 31 ms 21332 KB Output is correct
37 Correct 34 ms 24228 KB Output is correct
38 Correct 4 ms 12632 KB Output is correct
39 Correct 30 ms 19088 KB Output is correct
40 Correct 6 ms 14936 KB Output is correct
41 Correct 42 ms 20984 KB Output is correct
42 Correct 36 ms 22608 KB Output is correct
43 Correct 3 ms 12632 KB Output is correct
44 Correct 4 ms 13144 KB Output is correct
45 Correct 5 ms 15168 KB Output is correct
46 Correct 18 ms 19128 KB Output is correct

Subtask #5
0.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12632 KB Output is correct
2 Correct 5 ms 14680 KB Output is correct
3 Correct 3 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 5 ms 14684 KB Output is correct
7 Correct 35 ms 22760 KB Output is correct
8 Correct 4 ms 14680 KB Output is correct
9 Correct 4 ms 12724 KB Output is correct
10 Correct 4 ms 14680 KB Output is correct
11 Correct 3 ms 14684 KB Output is correct
12 Correct 5 ms 14684 KB Output is correct
13 Correct 30 ms 22460 KB Output is correct
14 Correct 4 ms 15192 KB Output is correct
15 Correct 4 ms 12632 KB Output is correct
16 Correct 3 ms 12888 KB Output is correct
17 Correct 5 ms 14684 KB Output is correct
18 Correct 4 ms 12892 KB Output is correct
19 Correct 4 ms 14684 KB Output is correct
20 Correct 4 ms 12832 KB Output is correct
21 Correct 4 ms 14680 KB Output is correct
22 Correct 5 ms 14680 KB Output is correct
23 Correct 4 ms 15196 KB Output is correct
24 Correct 5 ms 14684 KB Output is correct
25 Correct 5 ms 15196 KB Output is correct
26 Correct 4 ms 12736 KB Output is correct
27 Correct 4 ms 12636 KB Output is correct
28 Correct 3 ms 14684 KB Output is correct
29 Correct 3 ms 12632 KB Output is correct
30 Correct 24 ms 19776 KB Output is correct
31 Correct 20 ms 19292 KB Output is correct
32 Correct 3 ms 12636 KB Output is correct
33 Correct 3 ms 14684 KB Output is correct
34 Correct 3 ms 14680 KB Output is correct
35 Correct 3 ms 14684 KB Output is correct
36 Correct 31 ms 22364 KB Output is correct
37 Correct 3 ms 14684 KB Output is correct
38 Correct 4 ms 12636 KB Output is correct
39 Correct 4 ms 12632 KB Output is correct
40 Correct 3 ms 12632 KB Output is correct
41 Correct 21 ms 15960 KB Output is correct
42 Correct 5 ms 12996 KB Output is correct
43 Correct 49 ms 26924 KB Output is correct
44 Correct 37 ms 23928 KB Output is correct
45 Correct 36 ms 28872 KB Output is correct
46 Correct 4 ms 14684 KB Output is correct
47 Correct 4 ms 14680 KB Output is correct
48 Correct 4 ms 14684 KB Output is correct
49 Runtime error 16 ms 30044 KB Execution killed with signal 11
50 Halted 0 ms 0 KB -