Submission #996686

#	Time	Username	Problem	Language	Result	Execution time	Memory
996686		LOLOLO	Rigged Roads (NOI19_riggedroads)	C++17	27 / 100	198 ms	262148 KiB

riggedroads

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (ll)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())
 
ll mod = 1e9 + 7;
const int N = 3e5 + 10;
vector <pair <int, int>> ed[N];
int p[N][20], in[N], ou[N], timer = 1, id[N][20], cc = 0, a[N], b[N], used[N];

struct kahn{
    vector <int> ed[N * 21];
    int col[N * 21], cc = 1, e, used[N * 21];

    void add(int a, int b) {
        if (a == 0)
            return;

        ed[b].pb(a);
    }

    vector <int> lst;
    void dfs(int u, int is) {
        used[u] = 1; 
        for (auto x : ed[u]) {
            if (used[x] == 0) {
                dfs(x, 1);
            }
        }

        if (u <= e && is) {
            lst.pb(u);
        }
    }

    void process(int n) {
        e = n;
        for (int i = 1; i <= n; i++) {
            if (used[i] == 0)
                dfs(i, 0);

            sort(all(lst));
            for (auto x : lst) {
                col[x] = cc++;
            }

            lst.clear();

            if (col[i] == 0)
                col[i] = cc++;

            cout << col[i] << ' ';
        }

        cout << '\n';
    }
} E;

void dfs(int u, int v) {
    p[u][0] = v;
    for (int j = 1; j < 20; j++) {
        p[u][j] = p[p[u][j - 1]][j - 1];
        id[u][j] = cc++;
        E.add(id[u][j - 1], id[u][j]);
        E.add(id[p[u][j - 1]][j - 1], id[u][j]);
    }

    in[u] = timer++; 
    for (auto x : ed[u]) {
        if (x.f == v)
            continue;

        id[x.f][0] = x.s;
        dfs(x.f, u);
    }

    ou[u] = timer++;
}

bool is(int a, int b) {
    return in[a] <= in[b] && ou[a] >= in[b]; 
}

int lca(int a, int b) {
    if (is(a, b))
        return a;

    if (is(b, a))
        return b;

    for (int j = 19; j >= 0; j--) {
        if (is(p[a][j], b) == 0)
            a = p[a][j];
    }

    return p[a][0];
}

void path(int a, int b, int num) {
    int c = lca(a, b);
    for (int j = 19; j >= 0; j--) {
        if (is(c, p[a][j])) {
            E.add(id[a][j], num);
            a = p[a][j];
        }

        if (is(c, p[b][j])) {
            E.add(id[b][j], num);
            b = p[b][j];
        }
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    in[0] = 0;
    ou[0] = 1e9;
    int n, e;
    cin >> n >> e;

    cc = e + 1;
    for (int i = 1; i <= e; i++) {
        cin >> a[i] >> b[i];
    }

    for (int i = 1; i < n; i++) {
        int x;
        cin >> x;
        used[x] = 1;
        ed[a[x]].pb({b[x], x});
        ed[b[x]].pb({a[x], x});
    }

    dfs(1, 0);

    for (int i = 1; i <= e; i++) {
        if (used[i] == 0) {
            path(a[i], b[i], i);
        }
    }

    E.process(e);
    
    return 0;
}
 

• Subtask 1: 8 / 8
• Subtask 2: 19 / 19
• Subtask 3: 0 / 9
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 12
• Subtask 7: 0 / 32