Submission #1177105

#	Time	Username	Problem	Language	Result	Execution time	Memory
1177105		alexander707070	Longest Trip (IOI23_longesttrip)	C++20	30 / 100	5 ms	416 KiB

longesttrip

#include<bits/stdc++.h>

#include "longesttrip.h"

using namespace std;

int n,d;
vector<int> l,r;

bool query(vector<int> a,vector<int> b){
    return are_connected(a,b);
}

vector<int> longest_trip(int N, int D){
    n=N; d=D;
    l.clear(); r.clear();

    l.push_back(0);

    if(query({0},{1})){
        l.push_back(1);
    }else{
        r.push_back(1);
    }

    for(int i=2;i<n;i++){
        if(query({l.back()},{i})){
            l.push_back(i);

            if(!r.empty() and query({r.back()},{i})){
                while(!r.empty()){
                    l.push_back(r.back());
                    r.pop_back();
                }
            }
        }else{
            r.push_back(i);
        }
    }

    if(d==1){
        if(l.size()>r.size())return l;
        else return r;
    }else{
        if(r.empty())return l;

        if(int(l.size())<int(r.size()))swap(l,r);

        if(query({r[0]},{l.back()})){
            for(int i:r)l.push_back(i);
            return l;
        }

        if(query({r[0]},{l.front()})){
            while(!r.empty()){
                l.push_back(r.back());
                r.pop_back();
            }
            return l;
        }

        cout<<1/0;

    }

    return {};
}

Compilation message (stderr)

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:62:16: warning: division by zero [-Wdiv-by-zero]
   62 |         cout<<1/0;
      |               ~^~

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 25 / 25
• Subtask 4: 0 / 60