Submission #731612

#	Time	Username	Problem	Language	Result	Execution time	Memory
731612		stevancv	Swapping Cities (APIO20_swap)	C++14	0 / 100	4 ms	7380 KiB

swap

#include <bits/stdc++.h>
#include "swap.h"
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 1e5 + 2;
const int inf = 2e9 + 2;
int link[3 * N], ok[3 * N], mx[3 * N], cnt[N], tsz;
vector<int> g[3 * N];
int Find(int x) {
    if (x == link[x]) return x;
    return link[x] = Find(link[x]);
}
int par[3 * N][19], in[3 * N], out[3 * N], koji[3 * N];
void Dfs(int s, int e, int v) {
    if (ok[s] == 1) v = s;
    koji[s] = v;
    in[s] = ++tsz;
    par[s][0] = e;
    for (int i = 1; i < 19; i++) par[s][i] = par[par[s][i - 1]][i - 1];
    for (int u : g[s]) {
        Dfs(u, s, v);
    }
    out[s] = tsz;
}
bool Ancestor(int u, int v) {
    return in[u] <= in[v] && out[v] <= out[u];
}
int Lca(int u, int v) {
    if (Ancestor(u, v)) return u;
    if (Ancestor(v, u)) return v;
    for (int i = 18; i >= 0; i--) {
        if (par[u][i] && !Ancestor(par[u][i], v)) u = par[u][i];
    }
    return par[u][0];
}
void init(int n, int m, vector<int> u, vector<int> v, vector<int> w) {
    vector<array<int, 3>> e;
    for (int i = 0; i < m; i++) {
        u[i] += 1; v[i] += 1;
        e.push_back({w[i], u[i], v[i]});
    }
    sort(e.begin(), e.end());
    for (int i = 1; i <= n; i++) link[i] = i;
    tsz = n;
    for (auto u : e) {
        int c = u[0]; int a = u[1]; int b = u[2];
        if (Find(a) != Find(b)) {
            cnt[a] += 1; cnt[b] += 1; tsz += 1;
            a = Find(a); b = Find(b);
            g[tsz].push_back(a);
            g[tsz].push_back(b);
            link[a] = link[b] = link[tsz] = tsz;
            if (ok[a] || ok[b] || cnt[a] >= 3 || cnt[b] >= 3) ok[tsz] = 1;
            mx[tsz] = c;
            continue;
        }
        cnt[a] += 1; cnt[b] += 1; tsz += 1;
        a = Find(a);
        g[tsz].push_back(a);
        link[a] = link[tsz] = tsz;
        ok[tsz] = 1;
        mx[tsz] = c;
    }
    tsz = 0;
    Dfs(n + m, 0, 0);
}
int getMinimumFuelCapacity(int x, int y) {
    x += 1; y += 1;
    int o = koji[Lca(x, y)];
    return mx[o];
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 7
• Subtask 3: 0 / 17
• Subtask 4: 0 / 20
• Subtask 5: 0 / 23
• Subtask 6: 0 / 27