Submission #934451

#	Time	Username	Problem	Language	Result	Execution time	Memory
934451		irmuun	Fun Tour (APIO20_fun)	C++17	0 / 100	0 ms	348 KiB

fun

#include<bits/stdc++.h>
#include "fun.h"
 
using namespace std;
 
#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

vector<int>createFunTour(int N,int Q){
    vector<int>adj[N];
    for(int i=1;i<N;i++){
        int p=(i-1)/2;
        adj[i].pb(p);
        adj[p].pb(i);
    }
    set<pair<int,int>,greater<pair<int,int>>>st[N];
    for(int i=0;i<N;i++){
        int cur=i,dist=0;
        while(true){
            if(cur<i){
                st[cur].insert({dist,i});
            }
            if(cur==0) break;
            cur=(cur-1)/2;
            dist++;
        }
    }
    auto [z,s]=*st[0].begin();
    vector<int>ans={s};
    int cur=s,bef=-1;
    for(int i=2;i<=N;i++){
        int dist=0;
        cur=s;
        while(true){
            if(cur<s){
                st[cur].erase({dist,s});
            }
            if(cur==0) break;
            cur=(cur-1)/2;
            dist++;
        }
        int mx=-1,nxt=-1,add=1;
        cur=s;
        while(true){
            if(cur<s){
                ll D,j;
                if(st[cur].size()==0){
                    D=0;
                    j=cur;
                    D+=add-1;
                }
                else{
                    for(auto u:adj[cur]){
                        if(u<cur||u==bef) continue;
                        if(st[u].size()>0){
                            auto p=*st[u].begin();
                            D=p.ff;
                            j=p.ss;
                            D+=add;
                        }
                        else{
                            D=0;
                            j=u;
                            D+=add-1;
                        }
                        break;
                    }
                }
                if(D>mx){
                    mx=D;
                    nxt=j;
                }
            }
            add++;
            if(cur==0) break;
            bef=cur;
            cur=(cur-1)/2;
        }
        ans.pb(nxt);
        s=nxt;
    }
    return ans;
}

Compilation message (stderr)

fun.cpp: In function 'std::vector<int> createFunTour(int, int)':
fun.cpp:75:24: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   75 |                     nxt=j;
      |                     ~~~^~
fun.cpp:74:23: warning: 'D' may be used uninitialized in this function [-Wmaybe-uninitialized]
   74 |                     mx=D;
      |                     ~~^~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 16
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 34