oj.uz

Submission #806780

# Submission time Handle Problem Language Result Execution time Memory
806780 2023-08-04T09:50:58 Z ashcomp LOSTIKS (INOI20_lostiks) C++14
100 / 100
 1404 ms 518304 KB 
#include<bits/stdc++.h>
using namespace std;
const int maxn=1e6+10,lg=21;
struct yal{
	int u,v,w;
	int getad(int fu){
		int ret=(u^v^fu);
		return ret;
	}
};
yal alled[maxn];
vector<int>adj[maxn];
int n,m,visa[maxn],lca[lg][maxn*2],wtf[2*maxn],ghabl[maxn],vis[maxn],high[maxn],timea,para[maxn],s,t;
pair<int,int>stf[maxn];
int dp[(1<<20)][20];
vector<int>allind[(1<<20)];
vector<int>allv;
vector<int>z;
 
void aval(){
	for(int i=1;i<(1<<20);i++)
	{
		int j=0;
		for(;;j++){
			if((i>>j)&1){
				break;
			}
		}
		allind[i]=allind[i^(1<<j)];
		allind[i].push_back(j);
	}
	int ha=-1;
	for(int i=1;i<2*maxn;i++){
		if(__builtin_popcount(i)==1){
			ha++;
		}
		wtf[i]=ha;
	}
}
 
void dfs(int u,int par=0){
	high[u]=high[par]+1;
	z.push_back(u);
	stf[u].first=(int)z.size()-1;
	for(auto x:adj[u]){
		int v=alled[x].getad(u);
		if(v!=par){
			if(v!=alled[x].v){
				swap(alled[x].u,alled[x].v);
			}
			para[v]=x;
			dfs(v,u);
			z.push_back(u);
		}
	}
	stf[u].second=(int)z.size()-1;
}
 
inline void callca(){
	for(int i=0;i<lg;i++){
		for(int j=0;j<(int)z.size();j++){
			if(i==0){
				lca[i][j]=z[j];
				continue;
			}
			if(high[lca[i-1][j]]<high[lca[i-1][j+(1<<(i-1))]]){
				lca[i][j]=lca[i-1][j];
			}
			else{
				lca[i][j]=lca[i-1][j+(1<<(i-1))];
			}
		}
	}
}
 
inline int getlca(int u,int v){
	int fu=min(stf[u].first,stf[v].first);
	int fv=max(stf[u].first,stf[v].first);
	u=fu;
	v=fv;
	int len=v-u+1;
	int te=wtf[len];
	if(high[lca[te][u]]<high[lca[te][v-(1<<te)+1]]){
		return lca[te][u];
	}
	return lca[te][v-(1<<te)+1];
}
 
inline int dis(int u,int v){
	int uv=getlca(u,v);
	int ret=high[u]+high[v]-2*high[uv];
	return ret;
}
 
void solve(int u){
	//cout<<u<<endl;
	if(vis[u]==1){
		return ;
	}
	if(visa[u]==1){
		cout<<-1<<"\n";
		exit(0);
	}
	visa[u]=1;
	solve(alled[para[u]].getad(u));
	if(alled[para[u]].w!=0){
		allv.push_back(para[u]);
		solve(alled[para[u]].w);
	}
	vis[u]=1;
	return ;
}
 
void calghabl(int u,int par=0){
	ghabl[u]+=ghabl[par];
	for(auto x:adj[u]){
		int v=alled[x].getad(u);
		if(v!=par){
			calghabl(v,u);
		}
	}
}
 
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	aval();
	cin>>n;
	cin>>s>>t;
	for(int i=0;i<n-1;i++){
		cin>>alled[i].u>>alled[i].v>>alled[i].w;
		adj[alled[i].u].push_back(i);
		adj[alled[i].v].push_back(i);
	}
	dfs(s);
	callca();
	vis[s]=1;
	solve(t);
	m=allv.size();
	for(int i=0;i<m;i++){
		ghabl[alled[allv[i]].v]+=(1<<i);
	}
	calghabl(s);
	for(int i=1;i<(int)(1<<m);i++){
		for(auto x:allind[i]){
			int fake=1e9;
			if((ghabl[alled[allv[x]].u]&i)!=ghabl[alled[allv[x]].u]||(ghabl[alled[allv[x]].w]&i)!=ghabl[alled[allv[x]].w]){
				dp[i][x]=fake;
				continue;
			}
			if(__builtin_popcount(i)==1){
				dp[i][x]=dis(alled[allv[x]].u,alled[allv[x]].w)+dis(alled[allv[x]].w,s);
				continue;
			}
			for(auto y:allind[i^(1<<x)]){
				fake=min(fake,dis(alled[allv[y]].u,alled[allv[x]].w)+dis(alled[allv[x]].u,alled[allv[x]].w)+dp[(1<<x)^i][y]);
			}
			dp[i][x]=fake;
		}
	}
	if(m==0){
		int res=dis(s,t);
		cout<<res<<"\n";
		return 0;
	}
	else{
		int res=1e9;
		for(auto x:allind[(1<<m)-1]){
			res=min(res,dp[(1<<m)-1][x]+dis(alled[allv[x]].u,t));
		}
		cout<<res<<"\n";
	}
}

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 139 ms 142568 KB Output is correct
2 Correct 132 ms 142604 KB Output is correct
3 Correct 179 ms 167628 KB Output is correct
4 Correct 187 ms 167624 KB Output is correct
5 Correct 183 ms 167660 KB Output is correct
6 Correct 184 ms 167608 KB Output is correct
7 Correct 179 ms 167832 KB Output is correct
8 Correct 187 ms 167796 KB Output is correct
9 Correct 186 ms 168008 KB Output is correct
10 Correct 180 ms 167708 KB Output is correct
11 Correct 177 ms 167740 KB Output is correct
12 Correct 175 ms 169620 KB Output is correct
13 Correct 191 ms 169256 KB Output is correct
14 Correct 200 ms 168892 KB Output is correct
15 Correct 174 ms 169424 KB Output is correct
16 Correct 175 ms 170516 KB Output is correct
17 Correct 178 ms 170552 KB Output is correct
18 Correct 181 ms 171020 KB Output is correct
19 Correct 185 ms 175136 KB Output is correct
20 Correct 176 ms 174944 KB Output is correct
21 Correct 182 ms 174764 KB Output is correct
22 Correct 134 ms 142644 KB Output is correct
23 Correct 126 ms 142700 KB Output is correct
24 Correct 133 ms 142616 KB Output is correct
25 Correct 139 ms 142716 KB Output is correct
26 Correct 123 ms 142624 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 127 ms 142560 KB Output is correct
2 Correct 138 ms 142560 KB Output is correct
3 Correct 128 ms 142712 KB Output is correct
4 Correct 121 ms 142704 KB Output is correct
5 Correct 130 ms 145112 KB Output is correct
6 Correct 129 ms 144732 KB Output is correct
7 Correct 130 ms 144460 KB Output is correct
8 Correct 139 ms 144524 KB Output is correct
9 Correct 126 ms 144528 KB Output is correct
10 Correct 196 ms 185576 KB Output is correct
11 Correct 197 ms 185548 KB Output is correct
12 Correct 216 ms 185476 KB Output is correct
13 Correct 199 ms 185456 KB Output is correct
14 Correct 197 ms 185552 KB Output is correct
15 Correct 136 ms 145176 KB Output is correct
16 Correct 140 ms 144508 KB Output is correct
17 Correct 152 ms 144512 KB Output is correct
18 Correct 195 ms 185732 KB Output is correct
19 Correct 200 ms 185684 KB Output is correct
20 Correct 198 ms 185676 KB Output is correct
21 Correct 197 ms 185700 KB Output is correct
22 Correct 194 ms 185972 KB Output is correct
23 Correct 201 ms 185968 KB Output is correct
24 Correct 227 ms 186076 KB Output is correct
25 Correct 127 ms 142592 KB Output is correct

Subtask #3
41.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 139 ms 142568 KB Output is correct
2 Correct 132 ms 142604 KB Output is correct
3 Correct 179 ms 167628 KB Output is correct
4 Correct 187 ms 167624 KB Output is correct
5 Correct 183 ms 167660 KB Output is correct
6 Correct 184 ms 167608 KB Output is correct
7 Correct 179 ms 167832 KB Output is correct
8 Correct 187 ms 167796 KB Output is correct
9 Correct 186 ms 168008 KB Output is correct
10 Correct 180 ms 167708 KB Output is correct
11 Correct 177 ms 167740 KB Output is correct
12 Correct 175 ms 169620 KB Output is correct
13 Correct 191 ms 169256 KB Output is correct
14 Correct 200 ms 168892 KB Output is correct
15 Correct 174 ms 169424 KB Output is correct
16 Correct 175 ms 170516 KB Output is correct
17 Correct 178 ms 170552 KB Output is correct
18 Correct 181 ms 171020 KB Output is correct
19 Correct 185 ms 175136 KB Output is correct
20 Correct 176 ms 174944 KB Output is correct
21 Correct 182 ms 174764 KB Output is correct
22 Correct 134 ms 142644 KB Output is correct
23 Correct 126 ms 142700 KB Output is correct
24 Correct 133 ms 142616 KB Output is correct
25 Correct 139 ms 142716 KB Output is correct
26 Correct 123 ms 142624 KB Output is correct
27 Correct 127 ms 142560 KB Output is correct
28 Correct 138 ms 142560 KB Output is correct
29 Correct 128 ms 142712 KB Output is correct
30 Correct 121 ms 142704 KB Output is correct
31 Correct 130 ms 145112 KB Output is correct
32 Correct 129 ms 144732 KB Output is correct
33 Correct 130 ms 144460 KB Output is correct
34 Correct 139 ms 144524 KB Output is correct
35 Correct 126 ms 144528 KB Output is correct
36 Correct 196 ms 185576 KB Output is correct
37 Correct 197 ms 185548 KB Output is correct
38 Correct 216 ms 185476 KB Output is correct
39 Correct 199 ms 185456 KB Output is correct
40 Correct 197 ms 185552 KB Output is correct
41 Correct 136 ms 145176 KB Output is correct
42 Correct 140 ms 144508 KB Output is correct
43 Correct 152 ms 144512 KB Output is correct
44 Correct 195 ms 185732 KB Output is correct
45 Correct 200 ms 185684 KB Output is correct
46 Correct 198 ms 185676 KB Output is correct
47 Correct 197 ms 185700 KB Output is correct
48 Correct 194 ms 185972 KB Output is correct
49 Correct 201 ms 185968 KB Output is correct
50 Correct 227 ms 186076 KB Output is correct
51 Correct 127 ms 142592 KB Output is correct
52 Correct 1396 ms 407508 KB Output is correct
53 Correct 1357 ms 407668 KB Output is correct
54 Correct 1355 ms 404996 KB Output is correct
55 Correct 1400 ms 404808 KB Output is correct
56 Correct 1402 ms 405820 KB Output is correct
57 Correct 1404 ms 407284 KB Output is correct
58 Correct 128 ms 142668 KB Output is correct
59 Correct 129 ms 142720 KB Output is correct
60 Correct 130 ms 142612 KB Output is correct
61 Correct 1395 ms 407624 KB Output is correct
62 Correct 1380 ms 404504 KB Output is correct
63 Correct 1362 ms 409628 KB Output is correct
64 Correct 184 ms 169744 KB Output is correct
65 Correct 193 ms 171124 KB Output is correct
66 Correct 1385 ms 407632 KB Output is correct
67 Correct 1355 ms 407360 KB Output is correct
68 Correct 1032 ms 403448 KB Output is correct
69 Correct 1066 ms 403568 KB Output is correct
70 Correct 1024 ms 402532 KB Output is correct
71 Correct 1063 ms 402680 KB Output is correct
72 Correct 1049 ms 402476 KB Output is correct
73 Correct 929 ms 398204 KB Output is correct
74 Correct 1205 ms 445952 KB Output is correct
75 Correct 1170 ms 445656 KB Output is correct
76 Correct 1108 ms 446592 KB Output is correct
77 Correct 1102 ms 445364 KB Output is correct
78 Correct 1020 ms 412212 KB Output is correct
79 Correct 1004 ms 411812 KB Output is correct
80 Correct 992 ms 410344 KB Output is correct
81 Correct 887 ms 422808 KB Output is correct
82 Correct 1066 ms 469300 KB Output is correct
83 Correct 1181 ms 469268 KB Output is correct
84 Correct 1132 ms 480312 KB Output is correct
85 Correct 1242 ms 518304 KB Output is correct
86 Correct 1201 ms 517260 KB Output is correct
87 Correct 1214 ms 517212 KB Output is correct