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Submission #405639

# Submission time Handle Problem Language Result Execution time Memory
405639 2021-05-16T15:50:10 Z AmineWeslati The Xana coup (BOI21_xanadu) C++14
100 / 100
 262 ms 32520 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef vector<int>vi;
#define pb push_back
#define sz(v) (int)v.size()
#define all(x) begin(x),end(x)

#define FOR(i,a,b) for(int i=a; i<b; i++)
#define ROF(i,a,b) for(int i=b-1; i>=a; i--)

void IO(){
#ifdef LOCAL
	freopen("input.txt","r",stdin);
	freopen("output.txt","w",stdout);

#endif
}
//-----------------------------------------

void ckmin(int &x, int y){
	x=min(x,y);
}

const int INF=1e7;
const int MX=1e5+10;
int N,memo[MX][2][2]; 
vi a(MX),adj[MX];

int solve(int u, int p, int i, int j){
	int &ind=memo[u][i][j];
	if(ind!=-1) return ind; 
	
	vi val(2,0); val[1]=INF; 
	for(int v: adj[u]) if(v!=p){
		vi new_val(2,INF);
		ckmin(new_val[0],val[1]+solve(v,u,j,1));
		ckmin(new_val[1],val[0]+solve(v,u,j,1));

		ckmin(new_val[0],val[0]+solve(v,u,j,0));
		ckmin(new_val[1],val[1]+solve(v,u,j,0));

		val.assign(all(new_val));
	}

	int state=((a[u]^i)^j); 
	int ans=j+val[state];

	return ind=ans; 
}

int main(){
	IO();

	cin>>N;
	FOR(i,0,N-1){
		int u,v; cin>>u>>v;
		adj[u].pb(v); 
		adj[v].pb(u);
	}
	FOR(i,1,N+1) cin>>a[i];

	memset(memo,-1,sizeof(memo));
	int ans=min(solve(1,1,0,1),solve(1,1,0,0)); 
	if(ans>=INF) cout << "impossible" << endl;
	else cout << ans << endl;

}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4556 KB Output is correct
2 Correct 3 ms 4588 KB Output is correct
3 Correct 3 ms 4556 KB Output is correct
4 Correct 3 ms 4556 KB Output is correct
5 Correct 3 ms 4556 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4556 KB Output is correct
2 Correct 3 ms 4588 KB Output is correct
3 Correct 3 ms 4556 KB Output is correct
4 Correct 3 ms 4556 KB Output is correct
5 Correct 3 ms 4556 KB Output is correct
6 Correct 3 ms 4584 KB Output is correct
7 Correct 3 ms 4556 KB Output is correct
8 Correct 3 ms 4556 KB Output is correct
9 Correct 3 ms 4588 KB Output is correct
10 Correct 3 ms 4556 KB Output is correct
11 Correct 3 ms 4596 KB Output is correct
12 Correct 3 ms 4584 KB Output is correct
13 Correct 3 ms 4592 KB Output is correct
14 Correct 3 ms 4556 KB Output is correct
15 Correct 3 ms 4588 KB Output is correct
16 Correct 3 ms 4556 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 237 ms 32360 KB Output is correct
2 Correct 218 ms 32036 KB Output is correct
3 Correct 208 ms 32520 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 190 ms 32404 KB Output is correct
2 Correct 234 ms 32024 KB Output is correct
3 Correct 262 ms 32476 KB Output is correct
4 Correct 171 ms 8516 KB Output is correct
5 Correct 210 ms 8932 KB Output is correct
6 Correct 222 ms 9072 KB Output is correct
7 Correct 4 ms 4580 KB Output is correct
8 Correct 54 ms 6172 KB Output is correct
9 Correct 210 ms 9300 KB Output is correct
10 Correct 191 ms 9328 KB Output is correct
11 Correct 196 ms 11000 KB Output is correct
12 Correct 213 ms 11252 KB Output is correct
13 Correct 214 ms 8764 KB Output is correct
14 Correct 179 ms 9012 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4556 KB Output is correct
2 Correct 3 ms 4588 KB Output is correct
3 Correct 3 ms 4556 KB Output is correct
4 Correct 3 ms 4556 KB Output is correct
5 Correct 3 ms 4556 KB Output is correct
6 Correct 3 ms 4584 KB Output is correct
7 Correct 3 ms 4556 KB Output is correct
8 Correct 3 ms 4556 KB Output is correct
9 Correct 3 ms 4588 KB Output is correct
10 Correct 3 ms 4556 KB Output is correct
11 Correct 3 ms 4596 KB Output is correct
12 Correct 3 ms 4584 KB Output is correct
13 Correct 3 ms 4592 KB Output is correct
14 Correct 3 ms 4556 KB Output is correct
15 Correct 3 ms 4588 KB Output is correct
16 Correct 3 ms 4556 KB Output is correct
17 Correct 237 ms 32360 KB Output is correct
18 Correct 218 ms 32036 KB Output is correct
19 Correct 208 ms 32520 KB Output is correct
20 Correct 190 ms 32404 KB Output is correct
21 Correct 234 ms 32024 KB Output is correct
22 Correct 262 ms 32476 KB Output is correct
23 Correct 171 ms 8516 KB Output is correct
24 Correct 210 ms 8932 KB Output is correct
25 Correct 222 ms 9072 KB Output is correct
26 Correct 4 ms 4580 KB Output is correct
27 Correct 54 ms 6172 KB Output is correct
28 Correct 210 ms 9300 KB Output is correct
29 Correct 191 ms 9328 KB Output is correct
30 Correct 196 ms 11000 KB Output is correct
31 Correct 213 ms 11252 KB Output is correct
32 Correct 214 ms 8764 KB Output is correct
33 Correct 179 ms 9012 KB Output is correct
34 Correct 3 ms 4588 KB Output is correct
35 Correct 3 ms 4556 KB Output is correct
36 Correct 3 ms 4556 KB Output is correct
37 Correct 3 ms 4556 KB Output is correct
38 Correct 3 ms 4544 KB Output is correct
39 Correct 3 ms 4556 KB Output is correct
40 Correct 3 ms 4556 KB Output is correct
41 Correct 3 ms 4516 KB Output is correct
42 Correct 3 ms 4588 KB Output is correct
43 Correct 3 ms 4556 KB Output is correct
44 Correct 3 ms 4556 KB Output is correct
45 Correct 211 ms 32292 KB Output is correct
46 Correct 208 ms 32012 KB Output is correct
47 Correct 241 ms 32508 KB Output is correct
48 Correct 184 ms 8712 KB Output is correct
49 Correct 245 ms 8900 KB Output is correct
50 Correct 200 ms 9028 KB Output is correct
51 Correct 4 ms 4556 KB Output is correct
52 Correct 52 ms 6216 KB Output is correct
53 Correct 193 ms 9312 KB Output is correct
54 Correct 227 ms 9328 KB Output is correct
55 Correct 215 ms 10948 KB Output is correct
56 Correct 198 ms 11224 KB Output is correct
57 Correct 180 ms 8776 KB Output is correct
58 Correct 210 ms 9064 KB Output is correct
59 Correct 60 ms 6164 KB Output is correct
60 Correct 195 ms 8988 KB Output is correct
61 Correct 195 ms 9156 KB Output is correct
62 Correct 209 ms 9288 KB Output is correct
63 Correct 178 ms 9412 KB Output is correct
64 Correct 181 ms 9224 KB Output is correct
65 Correct 176 ms 9548 KB Output is correct
66 Correct 185 ms 9616 KB Output is correct
67 Correct 161 ms 9480 KB Output is correct
68 Correct 170 ms 9404 KB Output is correct
69 Correct 167 ms 9404 KB Output is correct
70 Correct 140 ms 9432 KB Output is correct