Submission #749377

#	Time	Username	Problem	Language	Result	Execution time	Memory
749377		boyliguanhan	Cyberland (APIO23_cyberland)	C++17	100 / 100	2579 ms	167760 KiB

cyberland

#include "cyberland.h"
#pragma GCC optimize(2)
#define go(a,b,c,d) if(dis[a][b][c]>d) dis[a][b][c] = d, pq.push({b, {d, a, c}});
#include <bits/stdc++.h>
using namespace std;
double dis[100000][100][2], ans;
bool vis[100000];
vector<pair<int, int>> adj[100000];
void dfs(int n, int h) {
    if(vis[n]) return;
    vis[n] = 1;
    if(n==h) return;
    for(auto i: adj[n])
        dfs(i.first, h);
}
double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
    K = min(K, 100);
    arr[0] = 0, ans = 1e18;
    for(int i = 0; i < N; i++)
        for(auto &j: dis[i])
            j[0] = j[1] = 1e18;
    for(int i = 0; i < N; i++)
        adj[i].clear(), vis[i] = 0;
    for(int i = 0; i < M; i++)
        adj[x[i]].push_back({y[i], c[i]}), adj[y[i]].push_back({x[i], c[i]});
    dfs(0, H);
    if(!vis[H]) return -1;
    priority_queue<pair<int, tuple<double, int, int>>, vector<pair<int, tuple<double, int, int>>>, greater<>> pq;
    for(int i = 0; i < N; i++)
        if(vis[i]&&!arr[i])
            pq.push({0, {0, i, 0}});
    while(pq.size()) {
        double dist;
        int node, halves, halved;
        tie(dist, node, halved) = pq.top().second;
        halves = pq.top().first, pq.pop();
        if(node==H) {ans = min(ans, dist); continue;}
        if(!halved&&halves<K&&arr[node] == 2) go(node, halves+1, 1, dist/2);
        for(auto i: adj[node])
            go(i.first, halves, 0, dist+i.second);
    }
    return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 7 / 7
• Subtask 6: 16 / 16
• Subtask 7: 29 / 29
• Subtask 8: 3 / 3