Submission #645568

#	Time	Username	Problem	Language	Result	Execution time	Memory
645568		TimDee	Speedrun (RMI21_speedrun)	C++17	63 / 100	312 ms	852 KiB

speedrun

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

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

vector<vector<int>> adj(1e3+1);
vector<int> p(1e3+1,0);
void dfs(int u, int P) {
    for (auto v:adj[u]) {
        if (v==P) continue;
        p[v]=u;
        dfs(v,u);
    }
}
vector<pair<int,int>> toadd;
vector<pair<int,int>> edgeto(1e3+1);
void dfs2(int u, int P) {
    int cnt=0;
    for (auto v:adj[u]) {
        if (v==P) continue;
        if (cnt==0) {
            for (int j=10; j; --j) {
                setHint(u,j+10,!!(u&(1<<(j-1))));
                setHint(u,j+20,!!(v&(1<<(j-1))));
            }
            edgeto[u]={u,v};
            ++cnt;
        } else {
            toadd.push_back({u,v});
        }
    }
    if (cnt==0) {
        //cout<<u<<' '<<P<<": ";
        //for (auto x:toadd) cout<<x.first<<' '<<x.second<<"  ";
        //cout<<'\n';
        if (toadd.size()==0) return;
        auto k=toadd.back(); toadd.pop_back();
        for (int j=10; j; --j) {
            setHint(u,j+10,!!(k.first&(1<<(j-1))));
            setHint(u,j+20,!!(k.second&(1<<(j-1))));
        }
        edgeto[u]={k.first,k.second};
    }
    dfs2(edgeto[u].second,edgeto[u].first);
}

void assignHints(int id,int n, int a[], int b[]) {
    for (int i=1; i<n; ++i) {
        adj[a[i]].push_back(b[i]);
        adj[b[i]].push_back(a[i]);
    }
    dfs(1,0);
    setHintLen(30);
    for (int i=1; i<=n; ++i) {
        for (int j=10; j; --j) {
            setHint(i,j,!!(p[i]&(1<<(j-1))));
        }
    }
    dfs2(1,0);
}

vector<int> par(1e3+1,0);
int n;

void climb(int u, int need) {
    int p=0;
    for (int j=10; j; --j) p+=getHint(j)<<(j-1);
    if (p==need) return;
    par[u]=p;
    goTo(p);
    climb(u,need);
}

void visit(int u) {
    int x=0, y=0;
    int p=0;
    for (int j=10; j; --j) p+=getHint(j)<<(j-1);
    par[u]=p;
    for (int j=10; j; --j) x+=getHint(j+10)<<(j-1);
    for (int j=10; j; --j) y+=getHint(j+20)<<(j-1);
    par[y]=x;
    //cout<<u<<' '<<par[u]<<' '<<x<<' '<<y<<'\n';
    //int k; cin>>k;
    //if (k==-1) exit(0);
    if (x==y && y==0) return;
    if (u!=x) climb(u,par[x]);
    goTo(y);
    visit(y);
}

void speedrun(int id,int N,int start) {
    n=N;
    climb(start,0);
    visit(1);
}

• Subtask 1: 21 / 21
• Subtask 2: 0 / 8
• Subtask 3: 0 / 19
• Subtask 4: 12 / 12
• Subtask 5: 30 / 40