Submission #805415

#	Time	Username	Problem	Language	Result	Execution time	Memory
805415		Theo830	Cyberland (APIO23_cyberland)	C++17	97 / 100	3077 ms	159192 KiB

cyberland

            #include "cyberland.h"
            #include <bits/stdc++.h>
            using namespace std;
            #define f(i,a,b) for(int i = a;i < b;i++)
            #define ll int
            #define ii pair<ll,ll>
            #define id pair<double,ii>
            #define F first
            #define S second
            #define pb push_back
            priority_queue<id>pq;
            bool v[100005] = {0};
            double dist[100005][70];
            vector<vector<ii> >adj;
            ll H;
            void dfs(ll idx){
                v[idx] = 1;
                for(auto x:adj[idx]){
                    if(!v[x.F] && x.F != H){
                        dfs(x.F);
                    }
                }
            }
            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) {
                double ans;
                H = h;
              	k = min(k,69);
                adj.assign(n+5,vector<ii>());
                f(i,0,n){
                    v[i] = 0;
                    f(j,0,k+1){
                        dist[i][j] = 1e18;
                    }
                }
                f(i,0,m){
                    adj[x[i]].pb(ii(y[i],c[i]));
                    adj[y[i]].pb(ii(x[i],c[i]));
                }
                dfs(0);
                f(i,0,n){
                    if((arr[i] == 0 && v[i]) || i == 0){
                        pq.push(id(0,ii(i,0)));
                        dist[i][0] = 0;
                    }
                }
                ans = 1e18;
                while(!pq.empty()){
                    id f = pq.top();
                    pq.pop();
                    double w = -f.F;
                    ll u = f.S.F;
                    ll ek = f.S.S;
                    if(dist[u][ek] < w){
                        continue;
                    }
                    if(arr[u] == 2 && ek+1 <= k){
                        for(auto x:adj[u]){
                            if(x.F == h){
                                ans = min(ans,dist[u][ek]/(double)2 + (double)x.S);
                            }
                            else if(dist[x.F][ek+1] > dist[u][ek]/(double)2 + (double)x.S){
                                dist[x.F][ek+1] = dist[u][ek]/(double)2 + (double)x.S;
                                pq.push(id(-dist[x.F][ek+1],ii(x.F,ek+1)));
                            }
                        }
                    }
                    for(auto x:adj[u]){
                        if(x.F == h){
                            ans = min(ans,dist[u][ek] + x.S);
                        }
                        else if(dist[x.F][ek] > dist[u][ek] + x.S){
                            dist[x.F][ek] = dist[u][ek] + x.S;
                            pq.push(id(-dist[x.F][ek],ii(x.F,ek)));
                        }
                    }
                }
                if(ans == 1e18){
                    ans = -1;
                }
                return 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