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답안 #447249

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
447249 2021-07-25T13:36:30 Z ak2006 The Xana coup (BOI21_xanadu) C++14
100 / 100
 168 ms 39932 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
const ll mod = 1e9 + 7,inf = 1e18;
#define pb push_back
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
void setIO()
{
    fast;
}
int n = 1e5 + 5;
vvi adj(n);
vvvl dp(n,vvl(2,vl(2,1e9)));
vl vals(n);
void dfs(int u,int p)
{
    dp[u][vals[u]][0] = dp[u][vals[u]][1] = 0;
    for (int v:adj[u]){
        if (v == p)continue;
        dfs(v,u);
        vvl temp(4,vl(4));
        for (int f1 = 0;f1<2;f1++){
            for (int f2 = 0;f2<2;f2++){
                temp[f1][f2] = min(
                    dp[u][f1][f2] + dp[v][f2][0],
                    dp[u][!f1][f2] + dp[v][!f2][1] + 1
                    );
            }
        }
        for (int f1 = 0;f1<2;f1++)for (int f2 = 0;f2<2;f2++)dp[u][f1][f2] = temp[f1][f2];
    }
}
int main()
{
    setIO();
    cin>>n;
    for (int i = 1;i<=n - 1;i++){
        int u,v;
        cin>>u>>v;
        adj[u].pb(v),adj[v].pb(u);
    }
    for (int i = 1;i<=n;i++)cin>>vals[i];
    dfs(1,0);
    ll ans = min(dp[1][0][0],dp[1][1][1] + 1);
    if (ans > n)cout<<"impossible";
    else cout<<ans;
    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 18252 KB Output is correct
2 Correct 20 ms 18252 KB Output is correct
3 Correct 21 ms 18276 KB Output is correct
4 Correct 20 ms 18336 KB Output is correct
5 Correct 20 ms 18252 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 18252 KB Output is correct
2 Correct 20 ms 18252 KB Output is correct
3 Correct 21 ms 18276 KB Output is correct
4 Correct 20 ms 18336 KB Output is correct
5 Correct 20 ms 18252 KB Output is correct
6 Correct 20 ms 18264 KB Output is correct
7 Correct 21 ms 18252 KB Output is correct
8 Correct 20 ms 18336 KB Output is correct
9 Correct 23 ms 18332 KB Output is correct
10 Correct 21 ms 18252 KB Output is correct
11 Correct 21 ms 18232 KB Output is correct
12 Correct 21 ms 18232 KB Output is correct
13 Correct 21 ms 18252 KB Output is correct
14 Correct 27 ms 18328 KB Output is correct
15 Correct 21 ms 18340 KB Output is correct
16 Correct 21 ms 18336 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 102 ms 38540 KB Output is correct
2 Correct 103 ms 38340 KB Output is correct
3 Correct 103 ms 38584 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 112 ms 38700 KB Output is correct
2 Correct 102 ms 38340 KB Output is correct
3 Correct 103 ms 38584 KB Output is correct
4 Correct 124 ms 21036 KB Output is correct
5 Correct 130 ms 22724 KB Output is correct
6 Correct 148 ms 22684 KB Output is correct
7 Correct 23 ms 18332 KB Output is correct
8 Correct 56 ms 19908 KB Output is correct
9 Correct 129 ms 22868 KB Output is correct
10 Correct 153 ms 22908 KB Output is correct
11 Correct 139 ms 24132 KB Output is correct
12 Correct 128 ms 24396 KB Output is correct
13 Correct 138 ms 22468 KB Output is correct
14 Correct 145 ms 22792 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 20 ms 18252 KB Output is correct
2 Correct 20 ms 18252 KB Output is correct
3 Correct 21 ms 18276 KB Output is correct
4 Correct 20 ms 18336 KB Output is correct
5 Correct 20 ms 18252 KB Output is correct
6 Correct 20 ms 18264 KB Output is correct
7 Correct 21 ms 18252 KB Output is correct
8 Correct 20 ms 18336 KB Output is correct
9 Correct 23 ms 18332 KB Output is correct
10 Correct 21 ms 18252 KB Output is correct
11 Correct 21 ms 18232 KB Output is correct
12 Correct 21 ms 18232 KB Output is correct
13 Correct 21 ms 18252 KB Output is correct
14 Correct 27 ms 18328 KB Output is correct
15 Correct 21 ms 18340 KB Output is correct
16 Correct 21 ms 18336 KB Output is correct
17 Correct 102 ms 38540 KB Output is correct
18 Correct 103 ms 38340 KB Output is correct
19 Correct 103 ms 38584 KB Output is correct
20 Correct 112 ms 38700 KB Output is correct
21 Correct 102 ms 38340 KB Output is correct
22 Correct 103 ms 38584 KB Output is correct
23 Correct 124 ms 21036 KB Output is correct
24 Correct 130 ms 22724 KB Output is correct
25 Correct 148 ms 22684 KB Output is correct
26 Correct 23 ms 18332 KB Output is correct
27 Correct 56 ms 19908 KB Output is correct
28 Correct 129 ms 22868 KB Output is correct
29 Correct 153 ms 22908 KB Output is correct
30 Correct 139 ms 24132 KB Output is correct
31 Correct 128 ms 24396 KB Output is correct
32 Correct 138 ms 22468 KB Output is correct
33 Correct 145 ms 22792 KB Output is correct
34 Correct 23 ms 18228 KB Output is correct
35 Correct 21 ms 18332 KB Output is correct
36 Correct 20 ms 18332 KB Output is correct
37 Correct 23 ms 18252 KB Output is correct
38 Correct 22 ms 18332 KB Output is correct
39 Correct 21 ms 18312 KB Output is correct
40 Correct 21 ms 18304 KB Output is correct
41 Correct 21 ms 18328 KB Output is correct
42 Correct 21 ms 18252 KB Output is correct
43 Correct 21 ms 18248 KB Output is correct
44 Correct 21 ms 18252 KB Output is correct
45 Correct 104 ms 39844 KB Output is correct
46 Correct 105 ms 39624 KB Output is correct
47 Correct 107 ms 39932 KB Output is correct
48 Correct 114 ms 22212 KB Output is correct
49 Correct 122 ms 22724 KB Output is correct
50 Correct 134 ms 22680 KB Output is correct
51 Correct 21 ms 18284 KB Output is correct
52 Correct 49 ms 19852 KB Output is correct
53 Correct 129 ms 22832 KB Output is correct
54 Correct 142 ms 22948 KB Output is correct
55 Correct 124 ms 24252 KB Output is correct
56 Correct 129 ms 24388 KB Output is correct
57 Correct 113 ms 22468 KB Output is correct
58 Correct 168 ms 22680 KB Output is correct
59 Correct 49 ms 19912 KB Output is correct
60 Correct 107 ms 22392 KB Output is correct
61 Correct 122 ms 22724 KB Output is correct
62 Correct 156 ms 22948 KB Output is correct
63 Correct 129 ms 22948 KB Output is correct
64 Correct 132 ms 22896 KB Output is correct
65 Correct 128 ms 23320 KB Output is correct
66 Correct 115 ms 23236 KB Output is correct
67 Correct 101 ms 23200 KB Output is correct
68 Correct 107 ms 23160 KB Output is correct
69 Correct 124 ms 23228 KB Output is correct
70 Correct 103 ms 23192 KB Output is correct