oj.uz

Submission #412395

# Submission time Handle Problem Language Result Execution time Memory
412395 2021-05-26T19:51:41 Z ScarletS Railway (BOI17_railway) C++17
100 / 100
 197 ms 23768 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 1e5+4, lg = 17;
int tin[N], tout[N], t, up[lg][N], p[N][2], a[N], s[N], k;
vector<int> ans;
vector<array<int,2>> e[N];

void dfs(int c)
{
    tin[c]=++t;
    up[0][c]=p[c][0];
    for (int i=1;i<lg;++i)
        up[i][c]=up[i-1][up[i-1][c]];
    for (auto i : e[c])
        if (i[0]!=p[c][0])
        {
            p[i[0]][0]=c;
            p[i[0]][1]=i[1];
            dfs(i[0]);
        }
    tout[c]=++t;
}

bool cmp(int x, int y)
{
    return tin[x] < tin[y];
}

bool isAncestor(int x, int y)
{
    return (tin[x]<=tin[y]&&tout[y]<=tout[x]);
}

int lca(int x, int y)
{
    if (isAncestor(x,y))
        return x;
    if (isAncestor(y,x))
        return y;
    for (int i=lg-1;i>=0;--i)
        if (!isAncestor(up[i][x],y))
            x=up[i][x];
    return up[0][x];
}

void dfsAns(int c)
{
    for (auto i : e[c])
        if (i[0]!=p[c][0])
        {
            dfsAns(i[0]);
            a[c]+=a[i[0]];
        }
    if (a[c]>=k*2)
        ans.push_back(p[c][1]);
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n,m,x,y;
    cin>>n>>m>>k;
    for (int i=1;i<n;++i)
    {
        cin>>x>>y;
        e[x].push_back({y,i});
        e[y].push_back({x,i});
    }
    dfs(1);
    tout[0]=++t;
    while (m--)
    {
        cin>>x;
        for (int i=0;i<x;++i)
            cin>>s[i];
        sort(s,s+x,cmp);
        s[x]=s[0];
        for (int i=0;i<x;++i)
        {
            ++a[s[i]];
            ++a[s[i+1]];
            a[lca(s[i],s[i+1])]-=2;
        }
    }
    dfsAns(1);
    cout<<ans.size()<<"\n";
    sort(ans.begin(), ans.end());
    for (int i : ans)
        cout<<i<<" ";
    return 0;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2764 KB Output is correct
2 Correct 7 ms 4044 KB Output is correct
3 Correct 8 ms 4044 KB Output is correct
4 Correct 2 ms 2764 KB Output is correct
5 Correct 2 ms 2764 KB Output is correct
6 Correct 8 ms 4428 KB Output is correct
7 Correct 8 ms 4172 KB Output is correct
8 Correct 7 ms 4044 KB Output is correct
9 Correct 7 ms 4096 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 2 ms 2764 KB Output is correct
12 Correct 2 ms 2764 KB Output is correct
13 Correct 2 ms 2764 KB Output is correct
14 Correct 2 ms 2764 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2764 KB Output is correct
2 Correct 7 ms 4044 KB Output is correct
3 Correct 8 ms 4044 KB Output is correct
4 Correct 2 ms 2764 KB Output is correct
5 Correct 2 ms 2764 KB Output is correct
6 Correct 8 ms 4428 KB Output is correct
7 Correct 8 ms 4172 KB Output is correct
8 Correct 7 ms 4044 KB Output is correct
9 Correct 7 ms 4096 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 2 ms 2764 KB Output is correct
12 Correct 2 ms 2764 KB Output is correct
13 Correct 2 ms 2764 KB Output is correct
14 Correct 2 ms 2764 KB Output is correct
15 Correct 31 ms 4472 KB Output is correct
16 Correct 34 ms 4504 KB Output is correct
17 Correct 32 ms 4460 KB Output is correct
18 Correct 8 ms 4480 KB Output is correct
19 Correct 8 ms 4172 KB Output is correct
20 Correct 40 ms 4676 KB Output is correct
21 Correct 43 ms 4580 KB Output is correct
22 Correct 2 ms 2672 KB Output is correct
23 Correct 7 ms 4044 KB Output is correct
24 Correct 7 ms 4044 KB Output is correct
25 Correct 2 ms 2764 KB Output is correct
26 Correct 2 ms 2764 KB Output is correct
27 Correct 8 ms 4392 KB Output is correct
28 Correct 8 ms 4172 KB Output is correct
29 Correct 7 ms 4140 KB Output is correct
30 Correct 7 ms 4092 KB Output is correct
31 Correct 2 ms 2764 KB Output is correct
32 Correct 2 ms 2764 KB Output is correct
33 Correct 2 ms 2764 KB Output is correct
34 Correct 2 ms 2764 KB Output is correct
35 Correct 2 ms 2764 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 72 ms 21444 KB Output is correct
2 Correct 2 ms 2764 KB Output is correct
3 Correct 71 ms 22940 KB Output is correct
4 Correct 62 ms 22468 KB Output is correct
5 Correct 68 ms 23280 KB Output is correct
6 Correct 76 ms 23768 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 82 ms 18016 KB Output is correct
2 Correct 122 ms 17116 KB Output is correct
3 Correct 151 ms 16780 KB Output is correct
4 Correct 144 ms 16852 KB Output is correct
5 Correct 148 ms 16732 KB Output is correct
6 Correct 89 ms 19908 KB Output is correct
7 Correct 89 ms 19960 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 82 ms 18016 KB Output is correct
2 Correct 122 ms 17116 KB Output is correct
3 Correct 151 ms 16780 KB Output is correct
4 Correct 144 ms 16852 KB Output is correct
5 Correct 148 ms 16732 KB Output is correct
6 Correct 89 ms 19908 KB Output is correct
7 Correct 89 ms 19960 KB Output is correct
8 Correct 101 ms 19932 KB Output is correct
9 Correct 99 ms 19908 KB Output is correct
10 Correct 72 ms 23468 KB Output is correct
11 Correct 69 ms 23344 KB Output is correct
12 Correct 168 ms 16492 KB Output is correct
13 Correct 151 ms 16560 KB Output is correct
14 Correct 141 ms 16708 KB Output is correct
15 Correct 139 ms 16664 KB Output is correct
16 Correct 149 ms 16768 KB Output is correct
17 Correct 146 ms 16820 KB Output is correct
18 Correct 138 ms 16772 KB Output is correct
19 Correct 123 ms 17012 KB Output is correct
20 Correct 87 ms 20172 KB Output is correct
21 Correct 84 ms 20184 KB Output is correct
22 Correct 90 ms 20216 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2764 KB Output is correct
2 Correct 7 ms 4044 KB Output is correct
3 Correct 8 ms 4044 KB Output is correct
4 Correct 2 ms 2764 KB Output is correct
5 Correct 2 ms 2764 KB Output is correct
6 Correct 8 ms 4428 KB Output is correct
7 Correct 8 ms 4172 KB Output is correct
8 Correct 7 ms 4044 KB Output is correct
9 Correct 7 ms 4096 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 2 ms 2764 KB Output is correct
12 Correct 2 ms 2764 KB Output is correct
13 Correct 2 ms 2764 KB Output is correct
14 Correct 2 ms 2764 KB Output is correct
15 Correct 31 ms 4472 KB Output is correct
16 Correct 34 ms 4504 KB Output is correct
17 Correct 32 ms 4460 KB Output is correct
18 Correct 8 ms 4480 KB Output is correct
19 Correct 8 ms 4172 KB Output is correct
20 Correct 40 ms 4676 KB Output is correct
21 Correct 43 ms 4580 KB Output is correct
22 Correct 2 ms 2672 KB Output is correct
23 Correct 7 ms 4044 KB Output is correct
24 Correct 7 ms 4044 KB Output is correct
25 Correct 2 ms 2764 KB Output is correct
26 Correct 2 ms 2764 KB Output is correct
27 Correct 8 ms 4392 KB Output is correct
28 Correct 8 ms 4172 KB Output is correct
29 Correct 7 ms 4140 KB Output is correct
30 Correct 7 ms 4092 KB Output is correct
31 Correct 2 ms 2764 KB Output is correct
32 Correct 2 ms 2764 KB Output is correct
33 Correct 2 ms 2764 KB Output is correct
34 Correct 2 ms 2764 KB Output is correct
35 Correct 2 ms 2764 KB Output is correct
36 Correct 72 ms 21444 KB Output is correct
37 Correct 2 ms 2764 KB Output is correct
38 Correct 71 ms 22940 KB Output is correct
39 Correct 62 ms 22468 KB Output is correct
40 Correct 68 ms 23280 KB Output is correct
41 Correct 76 ms 23768 KB Output is correct
42 Correct 82 ms 18016 KB Output is correct
43 Correct 122 ms 17116 KB Output is correct
44 Correct 151 ms 16780 KB Output is correct
45 Correct 144 ms 16852 KB Output is correct
46 Correct 148 ms 16732 KB Output is correct
47 Correct 89 ms 19908 KB Output is correct
48 Correct 89 ms 19960 KB Output is correct
49 Correct 101 ms 19932 KB Output is correct
50 Correct 99 ms 19908 KB Output is correct
51 Correct 72 ms 23468 KB Output is correct
52 Correct 69 ms 23344 KB Output is correct
53 Correct 168 ms 16492 KB Output is correct
54 Correct 151 ms 16560 KB Output is correct
55 Correct 141 ms 16708 KB Output is correct
56 Correct 139 ms 16664 KB Output is correct
57 Correct 149 ms 16768 KB Output is correct
58 Correct 146 ms 16820 KB Output is correct
59 Correct 138 ms 16772 KB Output is correct
60 Correct 123 ms 17012 KB Output is correct
61 Correct 87 ms 20172 KB Output is correct
62 Correct 84 ms 20184 KB Output is correct
63 Correct 90 ms 20216 KB Output is correct
64 Correct 104 ms 20104 KB Output is correct
65 Correct 181 ms 16784 KB Output is correct
66 Correct 197 ms 16696 KB Output is correct
67 Correct 162 ms 16708 KB Output is correct
68 Correct 113 ms 16620 KB Output is correct
69 Correct 122 ms 16408 KB Output is correct
70 Correct 109 ms 20504 KB Output is correct
71 Correct 99 ms 19684 KB Output is correct
72 Correct 2 ms 2764 KB Output is correct
73 Correct 7 ms 4044 KB Output is correct
74 Correct 7 ms 4044 KB Output is correct
75 Correct 2 ms 2764 KB Output is correct
76 Correct 2 ms 2764 KB Output is correct
77 Correct 8 ms 4428 KB Output is correct
78 Correct 8 ms 4172 KB Output is correct
79 Correct 7 ms 4092 KB Output is correct
80 Correct 7 ms 4044 KB Output is correct
81 Correct 2 ms 2676 KB Output is correct
82 Correct 2 ms 2764 KB Output is correct
83 Correct 2 ms 2672 KB Output is correct
84 Correct 2 ms 2676 KB Output is correct
85 Correct 2 ms 2764 KB Output is correct
86 Correct 32 ms 4428 KB Output is correct
87 Correct 33 ms 4508 KB Output is correct
88 Correct 32 ms 4452 KB Output is correct
89 Correct 8 ms 4428 KB Output is correct
90 Correct 8 ms 4172 KB Output is correct
91 Correct 40 ms 4548 KB Output is correct
92 Correct 44 ms 4548 KB Output is correct
93 Correct 2 ms 2764 KB Output is correct
94 Correct 76 ms 23508 KB Output is correct
95 Correct 66 ms 22976 KB Output is correct
96 Correct 62 ms 22424 KB Output is correct
97 Correct 70 ms 23328 KB Output is correct
98 Correct 75 ms 23740 KB Output is correct
99 Correct 147 ms 16840 KB Output is correct
100 Correct 138 ms 16704 KB Output is correct
101 Correct 145 ms 16708 KB Output is correct
102 Correct 129 ms 17056 KB Output is correct
103 Correct 92 ms 19908 KB Output is correct
104 Correct 87 ms 20172 KB Output is correct
105 Correct 83 ms 19780 KB Output is correct
106 Correct 110 ms 20028 KB Output is correct
107 Correct 96 ms 19824 KB Output is correct
108 Correct 71 ms 23452 KB Output is correct
109 Correct 70 ms 23356 KB Output is correct
110 Correct 154 ms 16488 KB Output is correct
111 Correct 140 ms 16484 KB Output is correct
112 Correct 151 ms 16708 KB Output is correct
113 Correct 139 ms 16624 KB Output is correct