oj.uz

답안 #367452

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
367452 2021-02-17T12:20:52 Z valerikk 수도 (JOI20_capital_city) C++17
100 / 100
 1063 ms 39520 KB 
#include <bits/stdc++.h>
using namespace std;

#define pb push_back

const int MXN = 2e5 + 7;

int n, k;
vector<int> ed[MXN];
int c[MXN], tot[MXN], sz[MXN], ans = MXN;
bool del[MXN], used[MXN];
vector<int> nodes;
bool usedc[MXN];
vector<int> cc[MXN];
int pp[MXN];

int get_sz(int v, int p = -1) {
    sz[v] = 1;
    for (int u : ed[v]) {
        if (u != p && !del[u]) sz[v] += get_sz(u, v);
    }
    return sz[v];
}

int cent(int v, int nn, int p = -1) {
    for (int u : ed[v]) {
        if (u != p && !del[u] && 2 * sz[u] > nn) return cent(u, nn, v);
    }
    return v;
}

void dfs(int v, int p = -1) {
    pp[v] = p;
    nodes.pb(v);
    used[v] = usedc[c[v]] = 0;
    cc[c[v]].pb(v);
    for (int u : ed[v]) {
        if (u != p && !del[u]) dfs(u, v);
    }
}

void solve(int v) {
    get_sz(v);
    nodes.clear();
    dfs(v);
    queue<int> q;
    q.push(c[v]);
    used[v] = usedc[c[v]] = 1;
    int need = 0;
    while (!q.empty()) {
        int x = q.front();
        q.pop();
        for (int u : cc[x]) {
            int vv = u;
            while (!used[vv]) {
                used[vv] = 1;
                if (!usedc[c[vv]]) {
                    need++;
                    usedc[c[vv]] = 1;
                    q.push(c[vv]);
                }
                vv = pp[vv];
            }
        }
    }
    bool ok = 1;
    for (int u : nodes) {
        if (used[u]) ok &= cc[c[u]].size() == tot[c[u]];
    }
    for (int u : nodes) cc[c[u]].clear();
    if (ok) ans = min(ans, need);
    del[v] = 1;
    for (int u : ed[v]) {
        if (!del[u]) solve(cent(u, sz[u]));
    }
}   



int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n >> k;
    for (int i = 0; i < n - 1; i++) {
        int a, b;
        cin >> a >> b;
        a--;
        b--;
        ed[a].pb(b);
        ed[b].pb(a);
    }
    for (int i = 0; i < n; i++) {
        cin >> c[i];
        c[i]++;
        tot[c[i]]++;
    }
    solve(cent(0, get_sz(0)));
    cout << ans << endl;
    return 0;
}

Compilation message

capital_city.cpp: In function 'void solve(int)':
capital_city.cpp:68:44: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   68 |         if (used[u]) ok &= cc[c[u]].size() == tot[c[u]];
      |                            ~~~~~~~~~~~~~~~~^~~~~~~~~~~~

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9708 KB Output is correct
2 Correct 7 ms 9708 KB Output is correct
3 Correct 7 ms 9728 KB Output is correct
4 Correct 7 ms 9708 KB Output is correct
5 Correct 7 ms 9708 KB Output is correct
6 Correct 7 ms 9708 KB Output is correct
7 Correct 7 ms 9708 KB Output is correct
8 Correct 7 ms 9708 KB Output is correct
9 Correct 7 ms 9708 KB Output is correct
10 Correct 7 ms 9708 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9708 KB Output is correct
2 Correct 7 ms 9708 KB Output is correct
3 Correct 7 ms 9728 KB Output is correct
4 Correct 7 ms 9708 KB Output is correct
5 Correct 7 ms 9708 KB Output is correct
6 Correct 7 ms 9708 KB Output is correct
7 Correct 7 ms 9708 KB Output is correct
8 Correct 7 ms 9708 KB Output is correct
9 Correct 7 ms 9708 KB Output is correct
10 Correct 7 ms 9708 KB Output is correct
11 Correct 9 ms 9964 KB Output is correct
12 Correct 9 ms 9964 KB Output is correct
13 Correct 9 ms 9964 KB Output is correct
14 Correct 9 ms 9964 KB Output is correct
15 Correct 9 ms 9964 KB Output is correct
16 Correct 10 ms 9984 KB Output is correct
17 Correct 9 ms 10112 KB Output is correct
18 Correct 10 ms 9964 KB Output is correct
19 Correct 9 ms 9964 KB Output is correct
20 Correct 9 ms 9964 KB Output is correct
21 Correct 8 ms 9964 KB Output is correct
22 Correct 9 ms 10092 KB Output is correct
23 Correct 11 ms 9964 KB Output is correct
24 Correct 9 ms 9964 KB Output is correct
25 Correct 10 ms 9964 KB Output is correct
26 Correct 10 ms 9964 KB Output is correct
27 Correct 11 ms 9964 KB Output is correct
28 Correct 11 ms 9964 KB Output is correct
29 Correct 9 ms 9964 KB Output is correct
30 Correct 9 ms 9964 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 976 ms 39012 KB Output is correct
2 Correct 279 ms 39392 KB Output is correct
3 Correct 918 ms 38756 KB Output is correct
4 Correct 283 ms 39392 KB Output is correct
5 Correct 896 ms 36324 KB Output is correct
6 Correct 269 ms 39264 KB Output is correct
7 Correct 907 ms 36580 KB Output is correct
8 Correct 277 ms 38880 KB Output is correct
9 Correct 985 ms 34912 KB Output is correct
10 Correct 952 ms 32736 KB Output is correct
11 Correct 989 ms 35296 KB Output is correct
12 Correct 994 ms 37176 KB Output is correct
13 Correct 1016 ms 32480 KB Output is correct
14 Correct 956 ms 37600 KB Output is correct
15 Correct 999 ms 37256 KB Output is correct
16 Correct 944 ms 33376 KB Output is correct
17 Correct 986 ms 33632 KB Output is correct
18 Correct 984 ms 33888 KB Output is correct
19 Correct 986 ms 36448 KB Output is correct
20 Correct 958 ms 38240 KB Output is correct
21 Correct 8 ms 9708 KB Output is correct

Subtask #4
59.0 / 59.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9708 KB Output is correct
2 Correct 7 ms 9708 KB Output is correct
3 Correct 7 ms 9728 KB Output is correct
4 Correct 7 ms 9708 KB Output is correct
5 Correct 7 ms 9708 KB Output is correct
6 Correct 7 ms 9708 KB Output is correct
7 Correct 7 ms 9708 KB Output is correct
8 Correct 7 ms 9708 KB Output is correct
9 Correct 7 ms 9708 KB Output is correct
10 Correct 7 ms 9708 KB Output is correct
11 Correct 9 ms 9964 KB Output is correct
12 Correct 9 ms 9964 KB Output is correct
13 Correct 9 ms 9964 KB Output is correct
14 Correct 9 ms 9964 KB Output is correct
15 Correct 9 ms 9964 KB Output is correct
16 Correct 10 ms 9984 KB Output is correct
17 Correct 9 ms 10112 KB Output is correct
18 Correct 10 ms 9964 KB Output is correct
19 Correct 9 ms 9964 KB Output is correct
20 Correct 9 ms 9964 KB Output is correct
21 Correct 8 ms 9964 KB Output is correct
22 Correct 9 ms 10092 KB Output is correct
23 Correct 11 ms 9964 KB Output is correct
24 Correct 9 ms 9964 KB Output is correct
25 Correct 10 ms 9964 KB Output is correct
26 Correct 10 ms 9964 KB Output is correct
27 Correct 11 ms 9964 KB Output is correct
28 Correct 11 ms 9964 KB Output is correct
29 Correct 9 ms 9964 KB Output is correct
30 Correct 9 ms 9964 KB Output is correct
31 Correct 976 ms 39012 KB Output is correct
32 Correct 279 ms 39392 KB Output is correct
33 Correct 918 ms 38756 KB Output is correct
34 Correct 283 ms 39392 KB Output is correct
35 Correct 896 ms 36324 KB Output is correct
36 Correct 269 ms 39264 KB Output is correct
37 Correct 907 ms 36580 KB Output is correct
38 Correct 277 ms 38880 KB Output is correct
39 Correct 985 ms 34912 KB Output is correct
40 Correct 952 ms 32736 KB Output is correct
41 Correct 989 ms 35296 KB Output is correct
42 Correct 994 ms 37176 KB Output is correct
43 Correct 1016 ms 32480 KB Output is correct
44 Correct 956 ms 37600 KB Output is correct
45 Correct 999 ms 37256 KB Output is correct
46 Correct 944 ms 33376 KB Output is correct
47 Correct 986 ms 33632 KB Output is correct
48 Correct 984 ms 33888 KB Output is correct
49 Correct 986 ms 36448 KB Output is correct
50 Correct 958 ms 38240 KB Output is correct
51 Correct 8 ms 9708 KB Output is correct
52 Correct 649 ms 24984 KB Output is correct
53 Correct 744 ms 25056 KB Output is correct
54 Correct 710 ms 25056 KB Output is correct
55 Correct 737 ms 25056 KB Output is correct
56 Correct 750 ms 24928 KB Output is correct
57 Correct 743 ms 25060 KB Output is correct
58 Correct 698 ms 28256 KB Output is correct
59 Correct 696 ms 28576 KB Output is correct
60 Correct 893 ms 28268 KB Output is correct
61 Correct 948 ms 27872 KB Output is correct
62 Correct 266 ms 39380 KB Output is correct
63 Correct 268 ms 39392 KB Output is correct
64 Correct 281 ms 39136 KB Output is correct
65 Correct 289 ms 39520 KB Output is correct
66 Correct 500 ms 32608 KB Output is correct
67 Correct 520 ms 32352 KB Output is correct
68 Correct 511 ms 32608 KB Output is correct
69 Correct 474 ms 32668 KB Output is correct
70 Correct 497 ms 32352 KB Output is correct
71 Correct 466 ms 32644 KB Output is correct
72 Correct 491 ms 32608 KB Output is correct
73 Correct 465 ms 31712 KB Output is correct
74 Correct 516 ms 32556 KB Output is correct
75 Correct 502 ms 32480 KB Output is correct
76 Correct 791 ms 31544 KB Output is correct
77 Correct 812 ms 30108 KB Output is correct
78 Correct 955 ms 33760 KB Output is correct
79 Correct 997 ms 32136 KB Output is correct
80 Correct 973 ms 37820 KB Output is correct
81 Correct 983 ms 34912 KB Output is correct
82 Correct 1063 ms 35004 KB Output is correct
83 Correct 947 ms 32368 KB Output is correct
84 Correct 1006 ms 37148 KB Output is correct
85 Correct 1041 ms 35848 KB Output is correct
86 Correct 980 ms 32032 KB Output is correct
87 Correct 994 ms 33504 KB Output is correct
88 Correct 835 ms 34372 KB Output is correct
89 Correct 818 ms 31072 KB Output is correct
90 Correct 829 ms 30972 KB Output is correct
91 Correct 829 ms 32876 KB Output is correct
92 Correct 825 ms 31712 KB Output is correct
93 Correct 884 ms 31584 KB Output is correct
94 Correct 908 ms 31036 KB Output is correct
95 Correct 856 ms 32492 KB Output is correct
96 Correct 893 ms 31320 KB Output is correct
97 Correct 871 ms 32848 KB Output is correct