Submission #1292887

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292887		goulthen	Cyberland (APIO23_cyberland)	C++20	44 / 100	60 ms	56424 KiB

cyberland

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

using namespace std;

#define ld long double
#define pii pair<ld,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];

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,100);
    rep(i,0,N-1) mk[i] = 0;
    vector<vector<ld>> dist(N, vector<ld>(K+1,INF));
    vector<vector<pii>> g(N);

    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);
 
    priority_queue<z,vector<z>,greater<z>> pq;
    dist[0][0] = 0;
    pq.push({0,{0,0}});
    rep(i,1,N-1) if(arr[i]==0 && mk[i]) {
        pq.push({0,{i,0}});
        dist[i][0] = 0;
    }

    vector<vector<bool>> vis(N, vector<bool>(K+1,0LL));

    while (!pq.empty()) {
        auto [d,h] = pq.top();pq.pop();
        int u = h.first;
        int ck = h.second;

        if(vis[u][ck]) continue;
        //cout << u << ' ' << d << ' ' << ck << '\n';
        vis[u][ck] = 1;

        for(auto &[v,w] : g[u]) {
            rep(_,0,1) {
                ld nd = d+w;
                int cck = ck;
                
                if (nd < dist[v][cck]) {
                    dist[v][cck] = nd;
                    pq.push({dist[v][cck],{v,cck}});
                }

                if(arr[v] == 2 && cck < K) {
                    cck++;
                    nd/=2;
                }
            }
        }
    }

    if(!mk[H]) return -1;

    ld ans = INF;
    rep(i,0,K) ans = min(ans,dist[H][i]); 

    if(ans == INF) return -1;
    return ans;
}

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