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Submission #404667

# Submission time Handle Problem Language Result Execution time Memory
404667 2021-05-14T19:43:01 Z nicolaalexandra The Xana coup (BOI21_xanadu) C++14
100 / 100
 166 ms 17664 KB 
#include <bits/stdc++.h>
#define DIM 200010
#define INF 10000000
using namespace std;

int dp[DIM][2][2],v[DIM],aux[2][2];
vector <int> L[DIM];
int n,i,x,y;

void dfs (int nod, int tata){
    int ok = 0;
    for (auto vecin : L[nod])
        if (vecin != tata){
            ok = 1;
            dfs (vecin,nod);
        }
    if (!ok){
        dp[nod][v[nod]][0] = 0;
        dp[nod][1-v[nod]][1] = 1;
    } else {

        /// caz 1: nu dau switch in nod
        dp[nod][v[nod]][0] = 0;
        dp[nod][1-v[nod]][1] = 1;
        for (auto vecin : L[nod]){
            if (vecin == tata)
                continue;

            for (int i=0;i<2;i++)
                for (int j=0;j<2;j++)
                    aux[i][j] = INF;

            aux[0][0] = min (dp[nod][0][0] + dp[vecin][0][0], dp[nod][1][0] + dp[vecin][0][1]);
            aux[0][1] = min (dp[nod][0][1] + dp[vecin][1][0], dp[nod][1][1] + dp[vecin][1][1]);

            aux[1][0] = min (dp[nod][1][0] + dp[vecin][0][0], dp[nod][0][0] + dp[vecin][0][1]);
            aux[1][1] = min (dp[nod][1][1] + dp[vecin][1][0], dp[nod][0][1] + dp[vecin][1][1]);

            for (int i=0;i<2;i++)
                for (int j=0;j<2;j++)
                    dp[nod][i][j] = min(INF,aux[i][j]);
        }
    }
}

int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n;
    for (i=1;i<n;i++){
        cin>>x>>y;
        L[x].push_back(y);
        L[y].push_back(x);
    }

    for (i=1;i<=n;i++){
        cin>>v[i];
        dp[i][0][0] = dp[i][0][1] = dp[i][1][0] = dp[i][1][1] = INF;
    }

    dfs (1,0);

    int sol = min(dp[1][0][0],dp[1][0][1]);
    if (sol == INF)
        cout<<"impossible";
    else cout<<sol;


    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4916 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4916 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 4 ms 4940 KB Output is correct
12 Correct 4 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 120 ms 16160 KB Output is correct
2 Correct 109 ms 16068 KB Output is correct
3 Correct 115 ms 16260 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 16184 KB Output is correct
2 Correct 113 ms 16120 KB Output is correct
3 Correct 125 ms 16332 KB Output is correct
4 Correct 99 ms 9488 KB Output is correct
5 Correct 117 ms 9924 KB Output is correct
6 Correct 126 ms 11312 KB Output is correct
7 Correct 4 ms 5040 KB Output is correct
8 Correct 51 ms 7096 KB Output is correct
9 Correct 123 ms 11328 KB Output is correct
10 Correct 118 ms 11460 KB Output is correct
11 Correct 123 ms 11660 KB Output is correct
12 Correct 126 ms 11912 KB Output is correct
13 Correct 109 ms 10996 KB Output is correct
14 Correct 124 ms 11408 KB Output is correct

Subtask #5
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4916 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 4 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 4 ms 4940 KB Output is correct
12 Correct 4 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 120 ms 16160 KB Output is correct
18 Correct 109 ms 16068 KB Output is correct
19 Correct 115 ms 16260 KB Output is correct
20 Correct 114 ms 16184 KB Output is correct
21 Correct 113 ms 16120 KB Output is correct
22 Correct 125 ms 16332 KB Output is correct
23 Correct 99 ms 9488 KB Output is correct
24 Correct 117 ms 9924 KB Output is correct
25 Correct 126 ms 11312 KB Output is correct
26 Correct 4 ms 5040 KB Output is correct
27 Correct 51 ms 7096 KB Output is correct
28 Correct 123 ms 11328 KB Output is correct
29 Correct 118 ms 11460 KB Output is correct
30 Correct 123 ms 11660 KB Output is correct
31 Correct 126 ms 11912 KB Output is correct
32 Correct 109 ms 10996 KB Output is correct
33 Correct 124 ms 11408 KB Output is correct
34 Correct 3 ms 4940 KB Output is correct
35 Correct 3 ms 4940 KB Output is correct
36 Correct 3 ms 4940 KB Output is correct
37 Correct 4 ms 4940 KB Output is correct
38 Correct 3 ms 4940 KB Output is correct
39 Correct 4 ms 4996 KB Output is correct
40 Correct 3 ms 5000 KB Output is correct
41 Correct 3 ms 4940 KB Output is correct
42 Correct 3 ms 4940 KB Output is correct
43 Correct 3 ms 4940 KB Output is correct
44 Correct 3 ms 4940 KB Output is correct
45 Correct 115 ms 17536 KB Output is correct
46 Correct 108 ms 17468 KB Output is correct
47 Correct 114 ms 17664 KB Output is correct
48 Correct 104 ms 10676 KB Output is correct
49 Correct 115 ms 11172 KB Output is correct
50 Correct 128 ms 11332 KB Output is correct
51 Correct 4 ms 5004 KB Output is correct
52 Correct 37 ms 7076 KB Output is correct
53 Correct 121 ms 11388 KB Output is correct
54 Correct 152 ms 11380 KB Output is correct
55 Correct 126 ms 11684 KB Output is correct
56 Correct 119 ms 11972 KB Output is correct
57 Correct 116 ms 11004 KB Output is correct
58 Correct 126 ms 11320 KB Output is correct
59 Correct 37 ms 7108 KB Output is correct
60 Correct 106 ms 10748 KB Output is correct
61 Correct 112 ms 11292 KB Output is correct
62 Correct 125 ms 11568 KB Output is correct
63 Correct 166 ms 11404 KB Output is correct
64 Correct 130 ms 11432 KB Output is correct
65 Correct 109 ms 11860 KB Output is correct
66 Correct 110 ms 12024 KB Output is correct
67 Correct 104 ms 11840 KB Output is correct
68 Correct 109 ms 11872 KB Output is correct
69 Correct 103 ms 11768 KB Output is correct
70 Correct 102 ms 11836 KB Output is correct