Submission #1034528

#	Time	Username	Problem	Language	Result	Execution time	Memory
1034528		irmuun	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 KiB

islands

#include<bits/stdc++.h>
#include "islands.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()

const int maxn=2e5+5;

int n,m;
set<pair<int,int>>adj[maxn];
vector<int>ans,r;

bool solve(int x){
    if(adj[x].size()==0) return false;
    if(adj[x].size()==1){
        auto [y,sail]=*adj[x].begin();
        adj[x].erase(adj[x].begin());
        ans.pb(sail);
        r.pb(sail);
        return solve(y);
    }
    else{
        auto [y,sail]=*adj[x].begin();
        adj[x].erase(adj[x].begin());
        auto [z,sail2]=*adj[x].begin();
        adj[x].erase(adj[x].begin());
        ans.pb(sail);
        ans.pb(sail^1);
        ans.pb(sail2);
        ans.pb(sail2^1);
        ans.pb(sail^1);
        ans.pb(sail);
        ans.pb(sail2^1);
        ans.pb(sail2);
        return true;
    }
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccSV4n6z.o: in function `main':
grader.cpp:(.text.startup+0x229): undefined reference to `find_journey(int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status