Submission #970228

#	Time	Username	Problem	Language	Result	Execution time	Memory
970228		bachhoangxuan	Speedrun (RMI21_speedrun)	C++17	0 / 100	129 ms	1716 KiB

speedrun

#include "speedrun.h"
#include<bits/stdc++.h>
using namespace std;

const int maxn = 1005;
const int L = 20;
const int D = 1024;
int mask[maxn];
vector<int> edge[maxn];

void assignHints(int subtask, int N, int A[], int B[]) { /* your solution here */
    for(int i=1;i<N;i++){
        edge[A[i]].push_back(B[i]);
        edge[B[i]].push_back(A[i]);
    }
    function<void(int,int)> dfs = [&](int u,int p){
        int cc=0;
        for(int v:edge[u]){
            if(v==p) continue;
            dfs(v,u);
            if(cc) mask[cc]+=v*D;
            else mask[u]+=v;
            cc=v;
        }
        if(cc) mask[cc]+=p*D;
    };
    dfs(1,0);
    setHintLen(L);
    for(int i=1;i<=N;i++){
        for(int j=0;j<L;j++) setHint(i,j+1,mask[i]>>j&1);
    }
}

bool vis[maxn];

void speedrun(int subtask, int N, int start) { /* your solution here */
    int cnt=0;
    for(int i=1;i<=N;i++) mask[i]=0;
    function<void(int)> dfs = [&](int u){
        if(vis[u]) return;
        vis[u]=true;cnt++;
        for(int j=0;j<L;j++) mask[u]|=(getHint(j+1)<<j);
        int v=mask[u]%D;
        if(!v && v==start){
            for(int i=1;i<=N;i++) if(goTo(i)){
                dfs(i);goTo(v);
                break;
            }
        }
        while(v && cnt<N){
            if(!goTo(v)) break;
            dfs(v);goTo(u);
            v=mask[v]/D;
        }
    };
    dfs(start);
}

• Subtask 1: 0 / 21
• Subtask 2: 0 / 8
• Subtask 3: 0 / 19
• Subtask 4: 0 / 12
• Subtask 5: 0 / 40