Submission #985445

#	Time	Username	Problem	Language	Result	Execution time	Memory
985445		oviyan_gandhi	Cyberland (APIO23_cyberland)	C++17	97 / 100	3056 ms	30800 KiB

cyberland

#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long

#define MX 100000
int32_t powers[MX];
vector<pair<int,long double>> adj[MX];
priority_queue<pair<int,pair<long double,int>>,vector<pair<int,pair<long double,int>>>,greater<>> q;
bool visited[MX];

void dfs(int x){
    if(visited[x])return;
    visited[x]=true;
    if(powers[x]==0)q.emplace(0, make_pair(0,x));
    for(auto[dest,c]:adj[x])dfs(dest);
}

double solve(int32_t N, int32_t M, int32_t K, int32_t H, vector<int32_t> x, vector<int32_t> y, vector<int32_t> c, vector<int32_t> arr) {
    K = min(K, 67);
    for (int i = 0; i < N; i++){
        powers[i] = arr[i];
        adj[i].clear();
    }
    while(!q.empty())q.pop();
    fill(visited, visited+N, false);
    powers[0] = 0;
    visited[H]=true;
    for(int i=0;i<M;i++){
        adj[x[i]].emplace_back(y[i],c[i]);
        adj[y[i]].emplace_back(x[i],c[i]);
    }
    long double ans = 4e15;
    dfs(0);
    vector<vector<bool>> vis(N,vector<bool>(K+1));
    while(!q.empty()){
        auto [uses,curr] = q.top();q.pop();
        auto [tim,idx] = curr;
        if(idx==H){
            ans = min(ans,tim);
            continue;
        }
        if(vis[idx][uses])continue;
        vis[idx][uses]=true;
        for(auto[dest,cost]:adj[idx]){
            if(!vis[dest][uses])q.emplace(uses,make_pair(tim+cost,dest));
            if(powers[dest]==2 and uses<K and !vis[dest][uses+1])q.emplace(uses+1,make_pair((tim+cost)/(long double)(2),dest));
        }
    }
    return ans>=4e15 ? -1 : 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: 0 / 3