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답안 #966221

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
966221 2024-04-19T14:26:33 Z 12345678 수도 (JOI20_capital_city) C++17
100 / 100
 310 ms 68000 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=2e5+5, kx=18;

int n, k, u, v, t[nx], lvl[nx], pa[nx][kx], h[nx], vs[nx], rt[nx], sz[nx], ans=INT_MAX;
vector<int> d[nx], c[nx], rv[nx], g[nx];
stack<int> s;
vector<pair<int, int>> edg;

void dfs(int u, int p)
{
    lvl[u]=lvl[p]+1;
    pa[u][0]=p;
    for (int i=1; i<kx; i++) pa[u][i]=pa[pa[u][i-1]][i-1];
    for (auto v:d[u]) if (v!=p) dfs(v, u);
}

int lca(int u, int v)
{
    if (lvl[u]>lvl[v]) swap(u, v);
    for (int i=kx-1; i>=0; i--) if (lvl[pa[v][i]]>=lvl[u]) v=pa[v][i];
    if (u==v) return u;
    for (int i=kx-1; i>=0; i--) if (pa[u][i]!=pa[v][i]) u=pa[u][i], v=pa[v][i];
    return pa[u][0];
}

void dfs1(int u, int p)
{
    vs[u]=1;
    for (auto v:c[u]) if (v!=p&&!vs[v]) dfs1(v, u);
    s.push(u);
}

void dfs2(int u, int p, int hd)
{
    vs[u]=1;
    rt[u]=hd;
    sz[hd]++;
    for (auto v:rv[u]) if (v!=p&&!vs[v]) dfs2(v, u, hd);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>k;
    for (int i=1; i<n; i++) cin>>u>>v, d[u].push_back(v), d[v].push_back(u);
    for (int i=1; i<=n; i++) cin>>t[i], g[t[i]].push_back(i);
    dfs(1, 1);
    for (int i=1; i<=k; i++)
    {
        int hd=g[i][0];
        for (auto u:g[i]) hd=lca(hd, u);
        h[i]=hd;
    }
    for (int i=1; i<=n; i++) if (i!=h[t[i]]&&t[pa[i][0]]!=t[i]) c[t[i]].push_back(t[pa[i][0]]), rv[t[pa[i][0]]].push_back(t[i]), edg.push_back({t[i], t[pa[i][0]]}); //cout<<"edge "<<t[i]<<' '<<t[pa[i][0]]<<'\n';
    for (int i=1; i<=k; i++) if (!vs[i]) dfs1(i, i);
    for (int i=1; i<=k; i++) vs[i]=0;
    while (!s.empty())
    {
        u=s.top();
        //cout<<"stack "<<u<<'\n';
        s.pop();
        if (vs[u]) continue;
        dfs2(u, u, u);
    }
    //for (int i=1; i<=n; i++) cout<<"rt "<<i<<' '<<rt[i]<<'\n';
    for (auto [u, v]:edg) if (rt[u]!=rt[v]) sz[u]=1e9;
    for (int i=1; i<=k; i++) ans=min(ans, sz[rt[i]]);
    cout<<ans-1;
}

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 25176 KB Output is correct
2 Correct 6 ms 25256 KB Output is correct
3 Correct 5 ms 25180 KB Output is correct
4 Correct 7 ms 25180 KB Output is correct
5 Correct 5 ms 25180 KB Output is correct
6 Correct 5 ms 25180 KB Output is correct
7 Correct 6 ms 25180 KB Output is correct
8 Correct 6 ms 25180 KB Output is correct
9 Correct 6 ms 25436 KB Output is correct
10 Correct 5 ms 25180 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 25176 KB Output is correct
2 Correct 6 ms 25256 KB Output is correct
3 Correct 5 ms 25180 KB Output is correct
4 Correct 7 ms 25180 KB Output is correct
5 Correct 5 ms 25180 KB Output is correct
6 Correct 5 ms 25180 KB Output is correct
7 Correct 6 ms 25180 KB Output is correct
8 Correct 6 ms 25180 KB Output is correct
9 Correct 6 ms 25436 KB Output is correct
10 Correct 5 ms 25180 KB Output is correct
11 Correct 6 ms 25180 KB Output is correct
12 Correct 6 ms 25180 KB Output is correct
13 Correct 6 ms 25180 KB Output is correct
14 Correct 8 ms 25296 KB Output is correct
15 Correct 7 ms 25436 KB Output is correct
16 Correct 7 ms 25432 KB Output is correct
17 Correct 6 ms 25436 KB Output is correct
18 Correct 6 ms 25336 KB Output is correct
19 Correct 6 ms 25264 KB Output is correct
20 Correct 6 ms 25436 KB Output is correct
21 Correct 6 ms 25436 KB Output is correct
22 Correct 6 ms 25340 KB Output is correct
23 Correct 6 ms 25436 KB Output is correct
24 Correct 6 ms 25436 KB Output is correct
25 Correct 8 ms 25436 KB Output is correct
26 Correct 6 ms 25432 KB Output is correct
27 Correct 6 ms 25436 KB Output is correct
28 Correct 6 ms 25436 KB Output is correct
29 Correct 6 ms 25436 KB Output is correct
30 Correct 6 ms 25340 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 268 ms 67548 KB Output is correct
2 Correct 117 ms 67780 KB Output is correct
3 Correct 264 ms 67528 KB Output is correct
4 Correct 103 ms 67780 KB Output is correct
5 Correct 250 ms 65048 KB Output is correct
6 Correct 113 ms 67708 KB Output is correct
7 Correct 239 ms 64752 KB Output is correct
8 Correct 107 ms 66172 KB Output is correct
9 Correct 214 ms 62204 KB Output is correct
10 Correct 226 ms 60652 KB Output is correct
11 Correct 214 ms 62660 KB Output is correct
12 Correct 250 ms 64172 KB Output is correct
13 Correct 202 ms 60536 KB Output is correct
14 Correct 214 ms 64452 KB Output is correct
15 Correct 238 ms 64124 KB Output is correct
16 Correct 207 ms 61148 KB Output is correct
17 Correct 212 ms 61380 KB Output is correct
18 Correct 203 ms 61520 KB Output is correct
19 Correct 232 ms 63384 KB Output is correct
20 Correct 227 ms 65004 KB Output is correct
21 Correct 5 ms 25176 KB Output is correct

Subtask #4
59.0 / 59.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 25176 KB Output is correct
2 Correct 6 ms 25256 KB Output is correct
3 Correct 5 ms 25180 KB Output is correct
4 Correct 7 ms 25180 KB Output is correct
5 Correct 5 ms 25180 KB Output is correct
6 Correct 5 ms 25180 KB Output is correct
7 Correct 6 ms 25180 KB Output is correct
8 Correct 6 ms 25180 KB Output is correct
9 Correct 6 ms 25436 KB Output is correct
10 Correct 5 ms 25180 KB Output is correct
11 Correct 6 ms 25180 KB Output is correct
12 Correct 6 ms 25180 KB Output is correct
13 Correct 6 ms 25180 KB Output is correct
14 Correct 8 ms 25296 KB Output is correct
15 Correct 7 ms 25436 KB Output is correct
16 Correct 7 ms 25432 KB Output is correct
17 Correct 6 ms 25436 KB Output is correct
18 Correct 6 ms 25336 KB Output is correct
19 Correct 6 ms 25264 KB Output is correct
20 Correct 6 ms 25436 KB Output is correct
21 Correct 6 ms 25436 KB Output is correct
22 Correct 6 ms 25340 KB Output is correct
23 Correct 6 ms 25436 KB Output is correct
24 Correct 6 ms 25436 KB Output is correct
25 Correct 8 ms 25436 KB Output is correct
26 Correct 6 ms 25432 KB Output is correct
27 Correct 6 ms 25436 KB Output is correct
28 Correct 6 ms 25436 KB Output is correct
29 Correct 6 ms 25436 KB Output is correct
30 Correct 6 ms 25340 KB Output is correct
31 Correct 268 ms 67548 KB Output is correct
32 Correct 117 ms 67780 KB Output is correct
33 Correct 264 ms 67528 KB Output is correct
34 Correct 103 ms 67780 KB Output is correct
35 Correct 250 ms 65048 KB Output is correct
36 Correct 113 ms 67708 KB Output is correct
37 Correct 239 ms 64752 KB Output is correct
38 Correct 107 ms 66172 KB Output is correct
39 Correct 214 ms 62204 KB Output is correct
40 Correct 226 ms 60652 KB Output is correct
41 Correct 214 ms 62660 KB Output is correct
42 Correct 250 ms 64172 KB Output is correct
43 Correct 202 ms 60536 KB Output is correct
44 Correct 214 ms 64452 KB Output is correct
45 Correct 238 ms 64124 KB Output is correct
46 Correct 207 ms 61148 KB Output is correct
47 Correct 212 ms 61380 KB Output is correct
48 Correct 203 ms 61520 KB Output is correct
49 Correct 232 ms 63384 KB Output is correct
50 Correct 227 ms 65004 KB Output is correct
51 Correct 5 ms 25176 KB Output is correct
52 Correct 194 ms 55016 KB Output is correct
53 Correct 176 ms 55004 KB Output is correct
54 Correct 177 ms 54980 KB Output is correct
55 Correct 189 ms 55012 KB Output is correct
56 Correct 207 ms 54980 KB Output is correct
57 Correct 184 ms 55072 KB Output is correct
58 Correct 210 ms 58140 KB Output is correct
59 Correct 225 ms 58484 KB Output is correct
60 Correct 251 ms 58048 KB Output is correct
61 Correct 261 ms 58116 KB Output is correct
62 Correct 119 ms 68000 KB Output is correct
63 Correct 108 ms 67780 KB Output is correct
64 Correct 120 ms 66440 KB Output is correct
65 Correct 112 ms 67716 KB Output is correct
66 Correct 171 ms 57956 KB Output is correct
67 Correct 185 ms 57688 KB Output is correct
68 Correct 175 ms 57908 KB Output is correct
69 Correct 221 ms 57796 KB Output is correct
70 Correct 191 ms 57840 KB Output is correct
71 Correct 187 ms 57852 KB Output is correct
72 Correct 179 ms 57696 KB Output is correct
73 Correct 215 ms 57232 KB Output is correct
74 Correct 192 ms 58004 KB Output is correct
75 Correct 223 ms 57796 KB Output is correct
76 Correct 247 ms 62016 KB Output is correct
77 Correct 276 ms 61400 KB Output is correct
78 Correct 227 ms 61420 KB Output is correct
79 Correct 254 ms 60268 KB Output is correct
80 Correct 262 ms 64432 KB Output is correct
81 Correct 233 ms 62252 KB Output is correct
82 Correct 231 ms 62540 KB Output is correct
83 Correct 270 ms 60364 KB Output is correct
84 Correct 310 ms 64144 KB Output is correct
85 Correct 268 ms 63224 KB Output is correct
86 Correct 238 ms 60220 KB Output is correct
87 Correct 251 ms 61044 KB Output is correct
88 Correct 259 ms 61360 KB Output is correct
89 Correct 245 ms 58868 KB Output is correct
90 Correct 246 ms 58696 KB Output is correct
91 Correct 234 ms 60344 KB Output is correct
92 Correct 262 ms 59588 KB Output is correct
93 Correct 248 ms 59224 KB Output is correct
94 Correct 208 ms 58772 KB Output is correct
95 Correct 221 ms 59704 KB Output is correct
96 Correct 240 ms 59032 KB Output is correct
97 Correct 236 ms 60360 KB Output is correct