Submission #968312

#	Time	Username	Problem	Language	Result	Execution time	Memory
968312		Syrius	Cyberland (APIO23_cyberland)	C++17	0 / 100	73 ms	113744 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"
using namespace std;
 
// #define int long long
#define ll long long
#define ff first
#define ss second
#define pint pair < double , int >
#define vint vector < int >
#define fast ios_base::sync_with_stdio(NULL); cin.tie(NULL)
 
const ll inf = 1e18 + 9;
const int mxn = 2e5 + 2;
const int mod = 1e9 + 7;
 
vector < vector < pint > > adj(mxn);
vint arr_;
double dis[32][mxn];
bool vis[mxn];

priority_queue < pint > q[32];

void dfs(int x , int par , int H) {
    if (vis[x]) return;
    vis[x] = 1;
    if (x == H) return;
    if (arr_[x] == 0) q[0].push({0 , x});
    for (pint i : adj[x]) {
        if (i.ss == par) continue;
        dfs(i.ss , x , H);
    }
}
 
double solve(int n , int m , int k , int H , vint x , vint y , vint c , vint arr) {

    for (int i = 0; i < n; i++) {
        adj[i].clear();
        vis[i] = 0;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= k; j++) {
            dis[i][j] = -1;
        }
    }

    arr_ = arr;
    for (int i = 0; i < m; i++) {
        adj[x[i]].push_back({c[i] , y[i]});
        adj[y[i]].push_back({c[i] , x[i]});
    }

    dfs(0 , 0 , H);

    for (int i = 0; i <= k; i++) {
        while (!q[i].empty()) {
            pint p = q[i].top();
            q[i].pop();
            
            if (dis[i][p.ss] != -1) continue;
            dis[i][p.ss] = -p.ff;
            if (p.ss == H) continue;

            for (pint j : adj[p.ss]) {
                q[i].push({p.ff - j.ff , j.ss});
                if (arr[j.ss] == 2) q[i+1].push({(p.ff - j.ff) / 2 , j.ss});
            }
        }
    }

    double ans = inf;
    for (int i = 0; i <= k; i++) {
        if (dis[i][H] != -1) ans = min(ans , dis[i][H]);
    }

    return (ans == inf) ? -1 : ans;
}

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