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답안 #697293

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
697293 2023-02-09T06:44:48 Z Dan4Life The Xana coup (BOI21_xanadu) C++17
100 / 100
 77 ms 25096 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define int long long 
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int mxN = (int)1e5+10;
const int LINF = mxN*mxN;
int n, a[mxN], dp[mxN][2][2];
vector<int> adj[mxN];

void dfs(int s, int p){
    vector<int> v; v.clear();
    for(auto u : adj[s]){
        if(u!=p) dfs(u,s), v.pb(u);
    }
    if(!sz(v)){ dp[s][a[s]][0]=0, dp[s][a[s]^1][1]=1; return; }
    int dp2[sz(v)+1][2];
    for(int i = 0; i <= sz(v); i++)
        dp2[i][0]=dp2[i][1]=LINF;
    dp2[0][0] = 0;
    for(int i = 1; i <= sz(v); i++){
        dp2[i][0] = min(dp2[i-1][0]+dp[v[i-1]][0][0], 
                        dp2[i-1][1]+dp[v[i-1]][0][1]);
        dp2[i][1] = min(dp2[i-1][1]+dp[v[i-1]][0][0], 
                        dp2[i-1][0]+dp[v[i-1]][0][1]);
    }
    dp[s][a[s]][0] = dp2[sz(v)][0];
    dp[s][a[s]^1][0] = dp2[sz(v)][1];
    for(int i = 0; i <= sz(v); i++)
        dp2[i][0]=dp2[i][1]=LINF;
    dp2[0][0] = 0;

    for(int i = 1; i <= sz(v); i++){
        dp2[i][0] = min(dp2[i-1][0]+dp[v[i-1]][1][0], 
                        dp2[i-1][1]+dp[v[i-1]][1][1]);
        dp2[i][1] = min(dp2[i-1][1]+dp[v[i-1]][1][0], 
                        dp2[i-1][0]+dp[v[i-1]][1][1]);
    }
    dp[s][a[s]][1] = dp2[sz(v)][1]+1;
    dp[s][a[s]^1][1] = dp2[sz(v)][0]+1;
}

int32_t main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n;
    for(int i = 1; i < n; i++){
        int a, b; cin >> a >> b;
        adj[a].pb(b), adj[b].pb(a);
    }
    for(int i = 1; i <= n; i++) cin >> a[i];
    for(int i = 1; i <= n; i++)
        for(int j = 0; j < 2; j++)
            for(int k = 0; k < 2; k++)
                dp[i][j][k] = LINF;
    dfs(1,-1);
    int ans = min(dp[1][0][0],dp[1][0][1]);
    if(ans<LINF) cout << ans;
    else cout << "impossible";
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2684 KB Output is correct
2 Correct 2 ms 2676 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2680 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2684 KB Output is correct
2 Correct 2 ms 2676 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2680 KB Output is correct
6 Correct 2 ms 2680 KB Output is correct
7 Correct 1 ms 2676 KB Output is correct
8 Correct 2 ms 2676 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2676 KB Output is correct
13 Correct 2 ms 2676 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2680 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 24920 KB Output is correct
2 Correct 55 ms 24652 KB Output is correct
3 Correct 57 ms 25036 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 52 ms 24924 KB Output is correct
2 Correct 52 ms 24656 KB Output is correct
3 Correct 57 ms 25036 KB Output is correct
4 Correct 47 ms 10912 KB Output is correct
5 Correct 59 ms 11732 KB Output is correct
6 Correct 62 ms 11848 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 16 ms 5716 KB Output is correct
9 Correct 55 ms 11524 KB Output is correct
10 Correct 57 ms 11724 KB Output is correct
11 Correct 66 ms 12388 KB Output is correct
12 Correct 72 ms 12828 KB Output is correct
13 Correct 70 ms 11624 KB Output is correct
14 Correct 65 ms 12136 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2684 KB Output is correct
2 Correct 2 ms 2676 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2680 KB Output is correct
6 Correct 2 ms 2680 KB Output is correct
7 Correct 1 ms 2676 KB Output is correct
8 Correct 2 ms 2676 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2676 KB Output is correct
13 Correct 2 ms 2676 KB Output is correct
14 Correct 2 ms 2644 KB Output is correct
15 Correct 2 ms 2680 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 52 ms 24920 KB Output is correct
18 Correct 55 ms 24652 KB Output is correct
19 Correct 57 ms 25036 KB Output is correct
20 Correct 52 ms 24924 KB Output is correct
21 Correct 52 ms 24656 KB Output is correct
22 Correct 57 ms 25036 KB Output is correct
23 Correct 47 ms 10912 KB Output is correct
24 Correct 59 ms 11732 KB Output is correct
25 Correct 62 ms 11848 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 16 ms 5716 KB Output is correct
28 Correct 55 ms 11524 KB Output is correct
29 Correct 57 ms 11724 KB Output is correct
30 Correct 66 ms 12388 KB Output is correct
31 Correct 72 ms 12828 KB Output is correct
32 Correct 70 ms 11624 KB Output is correct
33 Correct 65 ms 12136 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 2 ms 2644 KB Output is correct
36 Correct 3 ms 2680 KB Output is correct
37 Correct 2 ms 2644 KB Output is correct
38 Correct 2 ms 2644 KB Output is correct
39 Correct 2 ms 2644 KB Output is correct
40 Correct 2 ms 2644 KB Output is correct
41 Correct 1 ms 2644 KB Output is correct
42 Correct 1 ms 2644 KB Output is correct
43 Correct 2 ms 2644 KB Output is correct
44 Correct 2 ms 2644 KB Output is correct
45 Correct 77 ms 25016 KB Output is correct
46 Correct 53 ms 24648 KB Output is correct
47 Correct 50 ms 25096 KB Output is correct
48 Correct 50 ms 10980 KB Output is correct
49 Correct 64 ms 11628 KB Output is correct
50 Correct 60 ms 11916 KB Output is correct
51 Correct 2 ms 2644 KB Output is correct
52 Correct 15 ms 5716 KB Output is correct
53 Correct 62 ms 11488 KB Output is correct
54 Correct 55 ms 11756 KB Output is correct
55 Correct 58 ms 12480 KB Output is correct
56 Correct 68 ms 12884 KB Output is correct
57 Correct 62 ms 11596 KB Output is correct
58 Correct 58 ms 12156 KB Output is correct
59 Correct 15 ms 5672 KB Output is correct
60 Correct 52 ms 10700 KB Output is correct
61 Correct 56 ms 11448 KB Output is correct
62 Correct 56 ms 11616 KB Output is correct
63 Correct 68 ms 11644 KB Output is correct
64 Correct 60 ms 11620 KB Output is correct
65 Correct 43 ms 12108 KB Output is correct
66 Correct 44 ms 12032 KB Output is correct
67 Correct 43 ms 14320 KB Output is correct
68 Correct 49 ms 14280 KB Output is correct
69 Correct 40 ms 14292 KB Output is correct
70 Correct 41 ms 14324 KB Output is correct