Submission #979568

#	Time	Username	Problem	Language	Result	Execution time	Memory
979568		phoenix0423	Cyberland (APIO23_cyberland)	C++17	15 / 100	929 ms	55244 KiB

cyberland

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#include "cyberland.h"
const int maxn = 2e5 + 5;
const double INF = 1e18;
const double eps = 1e-9;
vector<pll> adj[maxn];
int vis[maxn];
double dist[maxn][80];
 
void dfs(int pos){
    vis[pos] = 1;
    for(auto [x, w] : adj[pos]){
        if(vis[x]) continue;
        dfs(x);
    }
}
 
struct info{
    double d;
    int pos, l;
    info(){}
    info(double _d, int _pos, int _l) : d(_d), pos(_pos), l(_l){}
    bool operator < (const info& other) const{
        return d < other.d;
    }
    bool operator > (const info& other) const{
        return d > other.d;
    }
};
 
priority_queue<info, vector<info>, greater<info>> q;
 
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, 80);
    for(int i = 0; i < n; i++) adj[i].clear(), vis[i] = 0;
    for(int i = 0; i < m; i++){
        adj[x[i]].pb({y[i], c[i]});
        adj[y[i]].pb({x[i], c[i]});
    }
    dfs(0);
    if(!vis[h]) return -1;
    for(int i = 1; i < n; i++) for(int j = 0; j <= k; j++) dist[i][j] = INF;
    arr[0] = 0;
    for(int i = 0; i < n; i++){
        if(arr[i] == 0 && vis[i]){
            for(int j = 0; j <= k; j++) dist[i][j] = 0;
            q.push(info(0, i, 0));
        }
    }
    q.push(info(0, 0, 0));
    while(!q.empty()){
        auto [d, pos, l] = q.top(); q.pop();
        if(dist[pos][l] < d || pos == h) continue;
        if(arr[pos] == 0 && l > 0) continue;
        if(arr[pos] == 0) dist[pos][l] = d = 0;
        for(auto [x, w] : adj[pos]){
            if(dist[x][l] > d + w){
                dist[x][l] = d + w;
                q.push(info(dist[x][l], x, l));
            }
        }
        if(arr[pos] == 2 && l < k){
            d /= 2, l++;
            if(dist[pos][l] < d) continue;
            for(auto [x, w] : adj[pos]){
                if(dist[x][l] > d + w){
                    dist[x][l] = d + w;
                    q.push(info(dist[x][l], x, l));
                }
            }
        }
    }
    double ans = INF;
    // for(int i = 0; i <= k; i++) dijk();
    for(int i = 0; i <= k; i++) ans = min(ans, dist[h][i]);
    return ans;
}

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