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답안 #808576

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
808576 2023-08-05T07:57:54 Z FedShat 수도 (JOI20_capital_city) C++17
100 / 100
 1811 ms 361016 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;
constexpr int INF = numeric_limits<int>::max() / 2;
constexpr ll INFLL = numeric_limits<ll>::max() / 2;

template<class T>
istream &operator>>(istream &is, vector<T> &a) {
    for (auto &i : a) {
        is >> i;
    }
    return is;
}

#ifdef __APPLE__
#include "debug.h"
#else
#define debug(...) 42
#endif

struct LCA {
    vector<int> depth, parent, up;

    LCA() {}
    LCA(int n) {
        depth.resize(n);
        parent.resize(n);
        up.resize(n);
    }

    void add_leaf(int v, int par) {
        parent[v] = par;
        depth[v] = depth[par] + 1;
        if (depth[par] - depth[up[par]] == depth[up[par]] - depth[up[up[par]]]) {
            up[v] = up[up[par]];
        } else {
            up[v] = par;
        }
    }

    int la(int v, int k) {
        int h = max(depth[v] - k, 0);
        while (depth[v] != h) {
            if (depth[up[v]] >= h) {
                v = up[v];
            } else {
                v = parent[v];
            }
        }
        return v;
    }

    int lca(int v, int u) {
        if (depth[v] > depth[u]) {
            v = la(v, depth[v] - depth[u]);
        } else {
            u = la(u, depth[u] - depth[v]);
        }
        while (v != u) {
            if (up[v] != up[u]) {
                v = up[v];
                u = up[u];
            } else {
                v = parent[v];
                u = parent[u];
            }
        }
        return v;
    }
};

vector<vector<int>> tr, g, gg;
vector<int> tin, tout, c, ggg;
int timer = 0;
LCA st;
constexpr int LG = 18;

void add(int v, int p) {
    g.emplace_back();
    ggg[v] = g.size() - 1;
    g.back().push_back(c[v]);
    gg[0][v] = ggg[p];
    for (int i = 1; i < LG; ++i) {
        g.emplace_back();
        gg[i][v] = g.size() - 1;
        g.back().emplace_back(gg[i - 1][v]);
        g.back().emplace_back(gg[i - 1][st.la(v, 1 << (i - 1))]);
    }
}

void dfs(int v, int p) {
    tin[v] = timer++;
    if (p == -1) {
        g.emplace_back();
        ggg[v] = g.size() - 1;
        g.back().push_back(c[v]);
    }
    for (auto u : tr[v]) {
        if (u != p) {
            st.add_leaf(u, v);
            add(u, v);
            dfs(u, v);
        }
    }
    tout[v] = timer;
}

vector<int> val;
vector<int> curst;
vector<int> cond, siz;
int cnt = 0;
int k;

int dfs_scc(int j) {
    static int timer = 0;
    int low = val[j] = ++timer, x;
    curst.push_back(j);
    for (auto e : g[j]) {
        if (cond[e] < 0) {
            low = min(low, val[e] ? val[e] : dfs_scc(e));
        }
    }
    if (low == val[j]) {
        do {
            x = curst.back();
            curst.pop_back();
            siz[cnt] += (x < k);
            cond[x] = cnt;
        } while (x != j);
        ++cnt;
    }
    return val[j] = low;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
#ifdef __APPLE__
    freopen("input.txt", "r", stdin);
#endif
    int n;
    cin >> n >> k;
    tr.resize(n);
    for (int i = 0; i < n - 1; ++i) {
        int u, v;
        cin >> u >> v;
        --u;
        --v;
        tr[u].push_back(v);
        tr[v].push_back(u);
    }
    c.resize(n);
    cin >> c;
    for (auto &i : c) {
        --i;
    }
    tin.resize(n);
    tout.resize(n);
    st = LCA(n);
    g.reserve(LG * n + k);
    g.resize(k);
    gg.resize(LG, vector<int>(n));
    ggg.resize(n);
    dfs(0, -1);
    vector<vector<int>> cc(k);
    for (int i = 0; i < n; ++i) {
        cc[c[i]].push_back(i);
    }
    auto add_edges = [&](int v, int d) {
        int cv = c[v];
        // for (int i = 0; i < d; ++i) {
        //     v = st.up[0][v];
        //     g[cv].push_back(c[v]);
        // }
        // if (cv == 2) {
        //     cout << "nigga\n";
        // }
        for (int i = LG - 1; i >= 0; --i) {
            if (d >= (1 << i)) {
                g[cv].push_back(gg[i][v]);
                d -= (1 << i);
                v = st.la(v, (1 << i));
            }
        }
    };
    for (int i = 0; i < k; ++i) {
        sort(cc[i].begin(), cc[i].end(), [&](int u, int v) {
            return tin[u] < tin[v];
        });
        for (int j = 0; j + 1 < (int) cc[i].size(); ++j) {
            int l = st.lca(cc[i][j], cc[i][j + 1]);
            add_edges(cc[i][j], st.depth[cc[i][j]] - st.depth[l]);
            add_edges(cc[i][j + 1], st.depth[cc[i][j + 1]] - st.depth[l]);
        }
    }
    // for (int i = 0; i < (int) g.size(); ++i) {
    //     for (int j : g[i]) {
    //         cout << i + 1 << " " << j + 1 << "\n";
    //     }
    // }
    int sz = g.size();
    val.resize(sz);
    cond.resize(sz, -1);
    siz.resize(sz);
    for (int i = 0; i < sz; ++i) {
        if (cond[i] < 0) {
            dfs_scc(i);
        }
    }
    vector<int> iznas(cnt);
    for (int i = 0; i < sz; ++i) {
        for (auto j : g[i]) {
            if (cond[i] != cond[j]) {
                ++iznas[cond[i]];
            }
        }
    }
    // debug(siz);
    // debug(iznas);
    int ans = INF;
    for (int i = 0; i < cnt; ++i) {
        if (iznas[i] == 0) {
            ans = min(ans, siz[i]);
        }
    }
    cout << ans - 1 << "\n";
}

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 360 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 360 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 5 ms 3284 KB Output is correct
12 Correct 5 ms 3284 KB Output is correct
13 Correct 5 ms 3256 KB Output is correct
14 Correct 5 ms 3284 KB Output is correct
15 Correct 6 ms 3284 KB Output is correct
16 Correct 6 ms 3252 KB Output is correct
17 Correct 5 ms 3328 KB Output is correct
18 Correct 5 ms 3312 KB Output is correct
19 Correct 6 ms 3220 KB Output is correct
20 Correct 5 ms 3284 KB Output is correct
21 Correct 5 ms 3284 KB Output is correct
22 Correct 6 ms 3412 KB Output is correct
23 Correct 6 ms 3668 KB Output is correct
24 Correct 6 ms 3284 KB Output is correct
25 Correct 8 ms 3328 KB Output is correct
26 Correct 7 ms 3284 KB Output is correct
27 Correct 6 ms 3348 KB Output is correct
28 Correct 6 ms 3264 KB Output is correct
29 Correct 6 ms 3216 KB Output is correct
30 Correct 6 ms 3284 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1811 ms 361016 KB Output is correct
2 Correct 996 ms 315828 KB Output is correct
3 Correct 1781 ms 328248 KB Output is correct
4 Correct 974 ms 315908 KB Output is correct
5 Correct 1753 ms 356016 KB Output is correct
6 Correct 1006 ms 315664 KB Output is correct
7 Correct 1696 ms 343868 KB Output is correct
8 Correct 939 ms 313556 KB Output is correct
9 Correct 1322 ms 303352 KB Output is correct
10 Correct 1268 ms 300864 KB Output is correct
11 Correct 1438 ms 303876 KB Output is correct
12 Correct 1266 ms 306340 KB Output is correct
13 Correct 1279 ms 300496 KB Output is correct
14 Correct 1306 ms 306720 KB Output is correct
15 Correct 1330 ms 306144 KB Output is correct
16 Correct 1341 ms 301300 KB Output is correct
17 Correct 1298 ms 301644 KB Output is correct
18 Correct 1295 ms 302128 KB Output is correct
19 Correct 1319 ms 305148 KB Output is correct
20 Correct 1282 ms 307736 KB Output is correct
21 Correct 1 ms 212 KB Output is correct

Subtask #4
59.0 / 59.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 360 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 5 ms 3284 KB Output is correct
12 Correct 5 ms 3284 KB Output is correct
13 Correct 5 ms 3256 KB Output is correct
14 Correct 5 ms 3284 KB Output is correct
15 Correct 6 ms 3284 KB Output is correct
16 Correct 6 ms 3252 KB Output is correct
17 Correct 5 ms 3328 KB Output is correct
18 Correct 5 ms 3312 KB Output is correct
19 Correct 6 ms 3220 KB Output is correct
20 Correct 5 ms 3284 KB Output is correct
21 Correct 5 ms 3284 KB Output is correct
22 Correct 6 ms 3412 KB Output is correct
23 Correct 6 ms 3668 KB Output is correct
24 Correct 6 ms 3284 KB Output is correct
25 Correct 8 ms 3328 KB Output is correct
26 Correct 7 ms 3284 KB Output is correct
27 Correct 6 ms 3348 KB Output is correct
28 Correct 6 ms 3264 KB Output is correct
29 Correct 6 ms 3216 KB Output is correct
30 Correct 6 ms 3284 KB Output is correct
31 Correct 1811 ms 361016 KB Output is correct
32 Correct 996 ms 315828 KB Output is correct
33 Correct 1781 ms 328248 KB Output is correct
34 Correct 974 ms 315908 KB Output is correct
35 Correct 1753 ms 356016 KB Output is correct
36 Correct 1006 ms 315664 KB Output is correct
37 Correct 1696 ms 343868 KB Output is correct
38 Correct 939 ms 313556 KB Output is correct
39 Correct 1322 ms 303352 KB Output is correct
40 Correct 1268 ms 300864 KB Output is correct
41 Correct 1438 ms 303876 KB Output is correct
42 Correct 1266 ms 306340 KB Output is correct
43 Correct 1279 ms 300496 KB Output is correct
44 Correct 1306 ms 306720 KB Output is correct
45 Correct 1330 ms 306144 KB Output is correct
46 Correct 1341 ms 301300 KB Output is correct
47 Correct 1298 ms 301644 KB Output is correct
48 Correct 1295 ms 302128 KB Output is correct
49 Correct 1319 ms 305148 KB Output is correct
50 Correct 1282 ms 307736 KB Output is correct
51 Correct 1 ms 212 KB Output is correct
52 Correct 921 ms 297968 KB Output is correct
53 Correct 931 ms 297968 KB Output is correct
54 Correct 983 ms 298076 KB Output is correct
55 Correct 992 ms 298128 KB Output is correct
56 Correct 968 ms 297948 KB Output is correct
57 Correct 1072 ms 298036 KB Output is correct
58 Correct 1482 ms 300852 KB Output is correct
59 Correct 1259 ms 304208 KB Output is correct
60 Correct 1533 ms 304668 KB Output is correct
61 Correct 1462 ms 300656 KB Output is correct
62 Correct 1029 ms 315836 KB Output is correct
63 Correct 997 ms 315824 KB Output is correct
64 Correct 943 ms 314008 KB Output is correct
65 Correct 984 ms 315632 KB Output is correct
66 Correct 1275 ms 300736 KB Output is correct
67 Correct 1217 ms 301296 KB Output is correct
68 Correct 1064 ms 300708 KB Output is correct
69 Correct 1197 ms 300648 KB Output is correct
70 Correct 1232 ms 300752 KB Output is correct
71 Correct 1119 ms 300756 KB Output is correct
72 Correct 1129 ms 300700 KB Output is correct
73 Correct 1192 ms 301168 KB Output is correct
74 Correct 1146 ms 300748 KB Output is correct
75 Correct 1167 ms 300744 KB Output is correct
76 Correct 1244 ms 302944 KB Output is correct
77 Correct 1193 ms 302152 KB Output is correct
78 Correct 1419 ms 301700 KB Output is correct
79 Correct 1443 ms 299932 KB Output is correct
80 Correct 1386 ms 307184 KB Output is correct
81 Correct 1357 ms 303728 KB Output is correct
82 Correct 1334 ms 303496 KB Output is correct
83 Correct 1377 ms 300164 KB Output is correct
84 Correct 1442 ms 306120 KB Output is correct
85 Correct 1317 ms 304520 KB Output is correct
86 Correct 1436 ms 299864 KB Output is correct
87 Correct 1389 ms 301732 KB Output is correct
88 Correct 1699 ms 303664 KB Output is correct
89 Correct 1659 ms 299524 KB Output is correct
90 Correct 1590 ms 299328 KB Output is correct
91 Correct 1591 ms 301864 KB Output is correct
92 Correct 1648 ms 300260 KB Output is correct
93 Correct 1635 ms 299900 KB Output is correct
94 Correct 1478 ms 299396 KB Output is correct
95 Correct 1508 ms 301008 KB Output is correct
96 Correct 1602 ms 299528 KB Output is correct
97 Correct 1703 ms 301668 KB Output is correct