Submission #979525

#	Time	Username	Problem	Language	Result	Execution time	Memory
979525		phoenix0423	Cyberland (APIO23_cyberland)	C++17	15 / 100	546 ms	55088 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 par[maxn];
double dist[maxn][81];
int root(int x){ return x == par[x] ? x : par[x] = root(par[x]);}
void unite(int x, int y){
    x = root(x), y = root(y);
    if(x == y) return;
    par[x] = y;
}

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(), par[i] = i;
    for(int i = 0; i < m; i++){
        adj[x[i]].pb({y[i], c[i]});
        adj[y[i]].pb({x[i], c[i]});
        unite(x[i], y[i]);
    }
    if(root(0) != root(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 && root(i) == root(0)){
            for(int j = 0; j <= k; j++) dist[i][j] = 0;
            q.push(info(0, i, 0));
        }
    }
    while(!q.empty()){
        auto [d, pos, l] = q.top(); q.pop();
        if(dist[pos][l] < d || pos == h) 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));
            }
        }
        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++) 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