oj.uz

답안 #554479

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
554479 2022-04-28T13:12:31 Z Marceantasy The Xana coup (BOI21_xanadu) C++17
100 / 100
 79 ms 21588 KB 
#include <bits/stdc++.h> 
using namespace std; 

#define ll long long
#define ar array

const int mxN = 1e5+1, M = 1e9+7;
int n, f[mxN]; 
vector<int> adj[mxN]; 

struct node{
    int a[2][2];
    node(){
        memset(a, 0x3f, sizeof(a));
    }
    node operator+(const node &x){
        node ret; 
        for(int i = 0; i<2; ++i){
            for(int j = 0; j<2; ++j){
                for(int k = 0; k<2; ++k){
                    ret.a[i][j^k] = min(ret.a[i][j^k], a[i][j] + x.a[i][k]);
                }
            }
        }
        return ret;
    }
}dp[mxN];

void dfs(int u, int p = -1){
    node cur;
    cur.a[0][0] = 0; 
    cur.a[1][1] = 1;
    for(int v : adj[u]){
        if(v == p) continue;
        dfs(v, u); 
        node flag;
        for(int i = 0; i<2; ++i){
            for(int j = 0; j<2; ++j){
                flag.a[f[v]^j][i] = dp[v].a[i][j];
            }
        }
        cur = cur+flag;
    }
    dp[u] = cur;
}

int main(){
#ifdef _DEBUG
//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);
#endif
    std::ios_base::sync_with_stdio(false); std::cin.tie(0); std::cout.tie(0);

    cin >> n; 
    for(int i = 0; i<n-1; ++i){
        int u, v; 
        cin >> u >> v, --u, --v; 
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for(int i = 0; i<n; ++i){
        cin >> f[i];
    }
    dfs(0);
    int ans = min(dp[0].a[0][f[0]], dp[0].a[1][f[0]]);
    if(ans >= (int)1e7){
        cout << "impossible\n";
    }else{
        cout << ans;
    }
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4180 KB Output is correct
2 Correct 2 ms 4244 KB Output is correct
3 Correct 2 ms 4180 KB Output is correct
4 Correct 3 ms 4180 KB Output is correct
5 Correct 3 ms 4180 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4180 KB Output is correct
2 Correct 2 ms 4244 KB Output is correct
3 Correct 2 ms 4180 KB Output is correct
4 Correct 3 ms 4180 KB Output is correct
5 Correct 3 ms 4180 KB Output is correct
6 Correct 2 ms 4180 KB Output is correct
7 Correct 2 ms 4180 KB Output is correct
8 Correct 2 ms 4180 KB Output is correct
9 Correct 2 ms 4180 KB Output is correct
10 Correct 2 ms 4240 KB Output is correct
11 Correct 3 ms 4244 KB Output is correct
12 Correct 2 ms 4180 KB Output is correct
13 Correct 3 ms 4180 KB Output is correct
14 Correct 2 ms 4236 KB Output is correct
15 Correct 2 ms 4180 KB Output is correct
16 Correct 2 ms 4180 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 54 ms 21512 KB Output is correct
2 Correct 48 ms 21284 KB Output is correct
3 Correct 55 ms 21584 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 77 ms 21516 KB Output is correct
2 Correct 69 ms 21296 KB Output is correct
3 Correct 49 ms 21516 KB Output is correct
4 Correct 44 ms 8484 KB Output is correct
5 Correct 49 ms 8968 KB Output is correct
6 Correct 60 ms 9092 KB Output is correct
7 Correct 3 ms 4180 KB Output is correct
8 Correct 17 ms 5864 KB Output is correct
9 Correct 69 ms 9104 KB Output is correct
10 Correct 48 ms 9164 KB Output is correct
11 Correct 50 ms 10000 KB Output is correct
12 Correct 52 ms 10220 KB Output is correct
13 Correct 49 ms 8780 KB Output is correct
14 Correct 58 ms 9096 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4180 KB Output is correct
2 Correct 2 ms 4244 KB Output is correct
3 Correct 2 ms 4180 KB Output is correct
4 Correct 3 ms 4180 KB Output is correct
5 Correct 3 ms 4180 KB Output is correct
6 Correct 2 ms 4180 KB Output is correct
7 Correct 2 ms 4180 KB Output is correct
8 Correct 2 ms 4180 KB Output is correct
9 Correct 2 ms 4180 KB Output is correct
10 Correct 2 ms 4240 KB Output is correct
11 Correct 3 ms 4244 KB Output is correct
12 Correct 2 ms 4180 KB Output is correct
13 Correct 3 ms 4180 KB Output is correct
14 Correct 2 ms 4236 KB Output is correct
15 Correct 2 ms 4180 KB Output is correct
16 Correct 2 ms 4180 KB Output is correct
17 Correct 54 ms 21512 KB Output is correct
18 Correct 48 ms 21284 KB Output is correct
19 Correct 55 ms 21584 KB Output is correct
20 Correct 77 ms 21516 KB Output is correct
21 Correct 69 ms 21296 KB Output is correct
22 Correct 49 ms 21516 KB Output is correct
23 Correct 44 ms 8484 KB Output is correct
24 Correct 49 ms 8968 KB Output is correct
25 Correct 60 ms 9092 KB Output is correct
26 Correct 3 ms 4180 KB Output is correct
27 Correct 17 ms 5864 KB Output is correct
28 Correct 69 ms 9104 KB Output is correct
29 Correct 48 ms 9164 KB Output is correct
30 Correct 50 ms 10000 KB Output is correct
31 Correct 52 ms 10220 KB Output is correct
32 Correct 49 ms 8780 KB Output is correct
33 Correct 58 ms 9096 KB Output is correct
34 Correct 3 ms 4180 KB Output is correct
35 Correct 3 ms 4240 KB Output is correct
36 Correct 3 ms 4240 KB Output is correct
37 Correct 3 ms 4180 KB Output is correct
38 Correct 2 ms 4180 KB Output is correct
39 Correct 3 ms 4180 KB Output is correct
40 Correct 2 ms 4180 KB Output is correct
41 Correct 2 ms 4180 KB Output is correct
42 Correct 2 ms 4236 KB Output is correct
43 Correct 2 ms 4240 KB Output is correct
44 Correct 2 ms 4240 KB Output is correct
45 Correct 49 ms 21492 KB Output is correct
46 Correct 56 ms 21360 KB Output is correct
47 Correct 54 ms 21588 KB Output is correct
48 Correct 42 ms 8488 KB Output is correct
49 Correct 47 ms 8908 KB Output is correct
50 Correct 50 ms 8968 KB Output is correct
51 Correct 3 ms 4180 KB Output is correct
52 Correct 19 ms 5836 KB Output is correct
53 Correct 71 ms 9140 KB Output is correct
54 Correct 60 ms 9140 KB Output is correct
55 Correct 48 ms 10020 KB Output is correct
56 Correct 50 ms 10228 KB Output is correct
57 Correct 46 ms 8740 KB Output is correct
58 Correct 54 ms 9036 KB Output is correct
59 Correct 15 ms 5876 KB Output is correct
60 Correct 57 ms 8648 KB Output is correct
61 Correct 79 ms 9104 KB Output is correct
62 Correct 66 ms 9136 KB Output is correct
63 Correct 49 ms 9216 KB Output is correct
64 Correct 54 ms 9292 KB Output is correct
65 Correct 40 ms 9528 KB Output is correct
66 Correct 40 ms 9552 KB Output is correct
67 Correct 36 ms 9484 KB Output is correct
68 Correct 44 ms 9476 KB Output is correct
69 Correct 44 ms 9400 KB Output is correct
70 Correct 33 ms 9424 KB Output is correct