Submission #1292896

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292896		goulthen	Cyberland (APIO23_cyberland)	C++20	29 / 100	3134 ms	1052288 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"

using namespace std;

#define ld long double
#define pii pair<int,int>
#define ll long long
#define rep(i,a,b) for(int i = a; i <= b; i++)
const ll INF = 1e18+10;
const int MAXN = 1e5+10;
bool mk[MAXN];
ld pwr[72];

void dfs(int u, vector<vector<pii>> &g, int H) {
    if(mk[u]) return;
    mk[u] = 1;
    if (u==H) return;
    for(auto &[v,w] : g[u]) dfs(v,g,H);
}
using z = pair<ld, pair<int,int>>;

double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
    K=min(K,70);
    rep(i,0,N-1) mk[i] = 0;
    vector<vector<ld>> dist(N, vector<ld>(K+1,INF));
    vector<vector<pii>> g(N);
    pwr[0] = 1;
    rep(i,1,K) pwr[i] = pwr[i-1]/2.0;

    rep(i,0,M-1) {
        g[x[i]].emplace_back(y[i],c[i]);
        g[y[i]].emplace_back(x[i],c[i]);
    }
    dfs(0,g,H);

    arr[0] = 0;
 
    priority_queue<z,vector<z>,greater<z>> pq;
    dist[H][0] = 0;
    pq.push({0,{H,0}});
    if(!mk[H]) return -1;

    while (!pq.empty()) {
        auto [d,h] = pq.top();pq.pop();
        int u = h.first;
        int ck = h.second;
        //cout << u << ' ' << ck << ' ' << d << '\n';

        if(dist[u][ck] < d) continue;

        if(arr[u] == 0) return d;

        for(auto &[v,w] : g[u]) {
            if(!mk[v]) continue;

            ld nd = d+w*pwr[ck];
            int cck = ck;
            if(nd <= dist[v][cck]) {
                dist[v][cck] = nd;
                pq.push({nd,{v,cck}});
            }

            if(arr[u] == 2 && cck < K) cck++;
            nd = d + w*pwr[cck];
            if(nd <= dist[v][cck]) {
                dist[v][cck] = nd;
                pq.push({nd,(pii){v,cck}});
            }
        }
    }

    return -1;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 13 / 13
• Subtask 4: 0 / 19
• Subtask 5: 0 / 7
• Subtask 6: 16 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3