oj.uz

답안 #484874

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
484874 2021-11-05T16:48:31 Z ETK The Xana coup (BOI21_xanadu) C++14
100 / 100
 90 ms 38080 KB 
#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=(a);i<=(b);++i)
using namespace std;
const int N=1e6+5;
int n,f[N][2][2],C[N];//节点，是否操作，颜色
vector <int> G[N];
void dfs(int u,int fa){
    rep(i,0,1){
        f[u][i][C[u]^i]=i;
        f[u][i][C[u]^i^1]=n+1;
    }
    for(int v:G[u])if(v!=fa){
        dfs(v,u);
        rep(i,0,1){
            int f0=f[u][i][0],f1=f[u][i][1];
            f[u][i][0]=min(n+1,min(f0+f[v][0][i],f1+f[v][1][i]));
            f[u][i][1]=min(n+1,min(f0+f[v][1][i],f1+f[v][0][i]));
        }
    }
}
int main(){
    scanf("%d",&n);
    rep(i,2,n){
        int u,v;
        scanf("%d%d",&u,&v);
        G[u].push_back(v),G[v].push_back(u);
    }
    rep(i,1,n)scanf("%d",&C[i]);
    dfs(1,0);
    int ans=min(f[1][0][0],f[1][1][0]);
    if(ans>n)puts("impossible");
    else printf("%d\n",ans);
    return 0;
}

Compilation message

xanadu.cpp: In function 'int main()':
xanadu.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
xanadu.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |         scanf("%d%d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~
xanadu.cpp:28:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     rep(i,1,n)scanf("%d",&C[i]);
      |               ~~~~~^~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 23756 KB Output is correct
2 Correct 11 ms 23756 KB Output is correct
3 Correct 11 ms 23728 KB Output is correct
4 Correct 11 ms 23740 KB Output is correct
5 Correct 11 ms 23780 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 23756 KB Output is correct
2 Correct 11 ms 23756 KB Output is correct
3 Correct 11 ms 23728 KB Output is correct
4 Correct 11 ms 23740 KB Output is correct
5 Correct 11 ms 23780 KB Output is correct
6 Correct 11 ms 23756 KB Output is correct
7 Correct 11 ms 23748 KB Output is correct
8 Correct 11 ms 23756 KB Output is correct
9 Correct 11 ms 23764 KB Output is correct
10 Correct 11 ms 23784 KB Output is correct
11 Correct 11 ms 23780 KB Output is correct
12 Correct 11 ms 23784 KB Output is correct
13 Correct 11 ms 23788 KB Output is correct
14 Correct 11 ms 23680 KB Output is correct
15 Correct 11 ms 23688 KB Output is correct
16 Correct 11 ms 23756 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 60 ms 37956 KB Output is correct
2 Correct 57 ms 37700 KB Output is correct
3 Correct 66 ms 37932 KB Output is correct

Subtask #4
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 72 ms 37860 KB Output is correct
2 Correct 59 ms 37784 KB Output is correct
3 Correct 66 ms 38080 KB Output is correct
4 Correct 60 ms 29420 KB Output is correct
5 Correct 75 ms 30032 KB Output is correct
6 Correct 62 ms 30200 KB Output is correct
7 Correct 11 ms 23756 KB Output is correct
8 Correct 26 ms 25864 KB Output is correct
9 Correct 60 ms 30068 KB Output is correct
10 Correct 64 ms 30296 KB Output is correct
11 Correct 90 ms 30684 KB Output is correct
12 Correct 71 ms 30916 KB Output is correct
13 Correct 59 ms 29764 KB Output is correct
14 Correct 63 ms 30128 KB Output is correct

Subtask #5
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 23756 KB Output is correct
2 Correct 11 ms 23756 KB Output is correct
3 Correct 11 ms 23728 KB Output is correct
4 Correct 11 ms 23740 KB Output is correct
5 Correct 11 ms 23780 KB Output is correct
6 Correct 11 ms 23756 KB Output is correct
7 Correct 11 ms 23748 KB Output is correct
8 Correct 11 ms 23756 KB Output is correct
9 Correct 11 ms 23764 KB Output is correct
10 Correct 11 ms 23784 KB Output is correct
11 Correct 11 ms 23780 KB Output is correct
12 Correct 11 ms 23784 KB Output is correct
13 Correct 11 ms 23788 KB Output is correct
14 Correct 11 ms 23680 KB Output is correct
15 Correct 11 ms 23688 KB Output is correct
16 Correct 11 ms 23756 KB Output is correct
17 Correct 60 ms 37956 KB Output is correct
18 Correct 57 ms 37700 KB Output is correct
19 Correct 66 ms 37932 KB Output is correct
20 Correct 72 ms 37860 KB Output is correct
21 Correct 59 ms 37784 KB Output is correct
22 Correct 66 ms 38080 KB Output is correct
23 Correct 60 ms 29420 KB Output is correct
24 Correct 75 ms 30032 KB Output is correct
25 Correct 62 ms 30200 KB Output is correct
26 Correct 11 ms 23756 KB Output is correct
27 Correct 26 ms 25864 KB Output is correct
28 Correct 60 ms 30068 KB Output is correct
29 Correct 64 ms 30296 KB Output is correct
30 Correct 90 ms 30684 KB Output is correct
31 Correct 71 ms 30916 KB Output is correct
32 Correct 59 ms 29764 KB Output is correct
33 Correct 63 ms 30128 KB Output is correct
34 Correct 11 ms 23772 KB Output is correct
35 Correct 11 ms 23756 KB Output is correct
36 Correct 11 ms 23756 KB Output is correct
37 Correct 11 ms 23756 KB Output is correct
38 Correct 11 ms 23756 KB Output is correct
39 Correct 11 ms 23780 KB Output is correct
40 Correct 12 ms 23700 KB Output is correct
41 Correct 12 ms 23724 KB Output is correct
42 Correct 11 ms 23696 KB Output is correct
43 Correct 12 ms 23756 KB Output is correct
44 Correct 11 ms 23756 KB Output is correct
45 Correct 60 ms 37928 KB Output is correct
46 Correct 58 ms 37748 KB Output is correct
47 Correct 61 ms 37980 KB Output is correct
48 Correct 54 ms 29448 KB Output is correct
49 Correct 60 ms 30064 KB Output is correct
50 Correct 62 ms 30100 KB Output is correct
51 Correct 11 ms 23756 KB Output is correct
52 Correct 26 ms 25896 KB Output is correct
53 Correct 63 ms 30196 KB Output is correct
54 Correct 60 ms 30276 KB Output is correct
55 Correct 63 ms 30584 KB Output is correct
56 Correct 65 ms 30916 KB Output is correct
57 Correct 59 ms 29804 KB Output is correct
58 Correct 62 ms 30188 KB Output is correct
59 Correct 26 ms 26020 KB Output is correct
60 Correct 57 ms 29604 KB Output is correct
61 Correct 59 ms 30148 KB Output is correct
62 Correct 64 ms 30272 KB Output is correct
63 Correct 62 ms 30276 KB Output is correct
64 Correct 61 ms 30260 KB Output is correct
65 Correct 55 ms 30748 KB Output is correct
66 Correct 58 ms 30660 KB Output is correct
67 Correct 51 ms 30572 KB Output is correct
68 Correct 50 ms 30616 KB Output is correct
69 Correct 50 ms 30616 KB Output is correct
70 Correct 50 ms 30532 KB Output is correct