Submission #653250

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
653250	2022-10-26T10:10:34 Z	inksamurai	The Xana coup (BOI21_xanadu)	C++17	100 / 100	141 ms	44760 KB

xanadu

#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3D2ZDxo ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}

void chmin(int&a,int b){
	a=min(a,b);
}

signed main(){
_3D2ZDxo;
	int n;
	cin>>n;
	vec(vi) adj(n);
	rep(i,n-1){
		int u,v;
		cin>>u>>v;
		u-=1,v-=1;
		adj[u].pb(v);
		adj[v].pb(u);
	}
	vi a(n);
	rep(i,n){
		cin>>a[i];
	}
	rep(i,n){
		a[i]^=1;
	}
	const int inf=1e9;
	vec(vec(vi)) dp(n,vec(vi)(2,vi(2,inf)));
	auto dfs=[&](auto self,int v,int par)->void{
		for(auto u:adj[v]){
			if(u==par) continue;
			self(self,u,v);
		}
		vi fdp(2); // flip the root
		fdp[a[v]^1]=1;
		fdp[a[v]]=inf;
		for(auto u:adj[v]){
			if(u==par) continue;
			vi nfdp(2,inf);
			{
				int t=0;
				rep(t1,2){
					rep(wit,2){
						int nwit=wit^t1;
						chmin(nfdp[nwit],fdp[wit]+dp[u][t][t1]);
					}
				}
			}
			fdp=nfdp;
		}
		vi gdp(2); 
		gdp[a[v]]=0;
		gdp[a[v]^1]=inf;
		for(auto u:adj[v]){
			if(u==par) continue;
			vi ngdp(2,inf);
			{
				int t=1;
				rep(t1,2){
					rep(wit,2){
						int nwit=wit^t1;
						chmin(ngdp[nwit],gdp[wit]+dp[u][t][t1]);
					}
				}
			}
			gdp=ngdp;
		}
		rep(t,2){
			chmin(dp[v][t][1],fdp[t]);
			chmin(dp[v][t][0],gdp[t]);
		}
	};
	dfs(dfs,0,-1);
	int ans=min(dp[0][1][0],dp[0][1][1]);
	if(ans>=inf){
		print("impossible");
	}else{
		print(ans);
	}
}

Subtask #1
5.0 / 5.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	1 ms	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct

Subtask #2
15.0 / 15.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	1 ms	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	1 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	212 KB	Output is correct
10	Correct	1 ms	324 KB	Output is correct
11	Correct	1 ms	316 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	1 ms	320 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct

Subtask #3
10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	101 ms	43296 KB	Output is correct
2	Correct	97 ms	43924 KB	Output is correct
3	Correct	86 ms	44612 KB	Output is correct

Subtask #4
40.0 / 40.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	92 ms	43144 KB	Output is correct
2	Correct	98 ms	43820 KB	Output is correct
3	Correct	108 ms	44708 KB	Output is correct
4	Correct	99 ms	21068 KB	Output is correct
5	Correct	117 ms	22948 KB	Output is correct
6	Correct	127 ms	23416 KB	Output is correct
7	Correct	1 ms	340 KB	Output is correct
8	Correct	30 ms	7916 KB	Output is correct
9	Correct	116 ms	22952 KB	Output is correct
10	Correct	124 ms	23452 KB	Output is correct
11	Correct	104 ms	24268 KB	Output is correct
12	Correct	111 ms	25160 KB	Output is correct
13	Correct	115 ms	22172 KB	Output is correct
14	Correct	116 ms	23736 KB	Output is correct

Subtask #5
30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	1 ms	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	1 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	212 KB	Output is correct
10	Correct	1 ms	324 KB	Output is correct
11	Correct	1 ms	316 KB	Output is correct
12	Correct	1 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	1 ms	320 KB	Output is correct
16	Correct	1 ms	212 KB	Output is correct
17	Correct	101 ms	43296 KB	Output is correct
18	Correct	97 ms	43924 KB	Output is correct
19	Correct	86 ms	44612 KB	Output is correct
20	Correct	92 ms	43144 KB	Output is correct
21	Correct	98 ms	43820 KB	Output is correct
22	Correct	108 ms	44708 KB	Output is correct
23	Correct	99 ms	21068 KB	Output is correct
24	Correct	117 ms	22948 KB	Output is correct
25	Correct	127 ms	23416 KB	Output is correct
26	Correct	1 ms	340 KB	Output is correct
27	Correct	30 ms	7916 KB	Output is correct
28	Correct	116 ms	22952 KB	Output is correct
29	Correct	124 ms	23452 KB	Output is correct
30	Correct	104 ms	24268 KB	Output is correct
31	Correct	111 ms	25160 KB	Output is correct
32	Correct	115 ms	22172 KB	Output is correct
33	Correct	116 ms	23736 KB	Output is correct
34	Correct	1 ms	320 KB	Output is correct
35	Correct	1 ms	212 KB	Output is correct
36	Correct	1 ms	212 KB	Output is correct
37	Correct	1 ms	212 KB	Output is correct
38	Correct	1 ms	212 KB	Output is correct
39	Correct	1 ms	212 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct
41	Correct	1 ms	212 KB	Output is correct
42	Correct	1 ms	212 KB	Output is correct
43	Correct	1 ms	320 KB	Output is correct
44	Correct	0 ms	212 KB	Output is correct
45	Correct	93 ms	44432 KB	Output is correct
46	Correct	95 ms	43852 KB	Output is correct
47	Correct	105 ms	44760 KB	Output is correct
48	Correct	110 ms	20996 KB	Output is correct
49	Correct	118 ms	22988 KB	Output is correct
50	Correct	119 ms	23364 KB	Output is correct
51	Correct	1 ms	340 KB	Output is correct
52	Correct	30 ms	8020 KB	Output is correct
53	Correct	135 ms	22972 KB	Output is correct
54	Correct	112 ms	23452 KB	Output is correct
55	Correct	130 ms	24248 KB	Output is correct
56	Correct	136 ms	25272 KB	Output is correct
57	Correct	96 ms	22160 KB	Output is correct
58	Correct	115 ms	23620 KB	Output is correct
59	Correct	31 ms	7904 KB	Output is correct
60	Correct	106 ms	20964 KB	Output is correct
61	Correct	113 ms	22944 KB	Output is correct
62	Correct	115 ms	23444 KB	Output is correct
63	Correct	124 ms	23448 KB	Output is correct
64	Correct	119 ms	23368 KB	Output is correct
65	Correct	105 ms	23912 KB	Output is correct
66	Correct	102 ms	23880 KB	Output is correct
67	Correct	105 ms	23488 KB	Output is correct
68	Correct	109 ms	23528 KB	Output is correct
69	Correct	114 ms	23496 KB	Output is correct
70	Correct	141 ms	23540 KB	Output is correct

Submission #653250

Compilation message

Subtask #1 5.0 / 5.0

Subtask #2 15.0 / 15.0

Subtask #3 10.0 / 10.0

Subtask #4 40.0 / 40.0

Subtask #5 30.0 / 30.0

Subtask #1
5.0 / 5.0

Subtask #2
15.0 / 15.0

Subtask #3
10.0 / 10.0

Subtask #4
40.0 / 40.0

Subtask #5
30.0 / 30.0