Submission #1235698

#	Time	Username	Problem	Language	Result	Execution time	Memory
1235698		mariza	Thousands Islands (IOI22_islands)	C++20	1.75 / 100	18 ms	5192 KiB

islands

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

typedef long long ll;

variant<bool, vector<int>> find_journey(int n, int m, vector<int> u, vector<int> v) {
    vector<ll> g[n];
    for(ll i=0; i<m; i++){
        g[u[i]].push_back(v[i]);
    }

    if(g[0].size()==0) return false;
    else if(g[0].size()>=2) return true;
    else{
        ll curr=g[0][0], prev=0;
        while(g[curr].size()<=2){
            if(g[curr].size()==1) return false;
            else if(g[curr].size()>=3) return true;
            else{
                ll nxt;
                if(g[curr][0]==prev) nxt=g[curr][1];
                else nxt=g[curr][0];
                prev=curr;
                curr=nxt;
            }
        }
    }
}

Compilation message (stderr)

islands.cpp: In function 'std::variant<bool, std::vector<int, std::allocator<int> > > find_journey(int, int, std::vector<int>, std::vector<int>)':
islands.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type]
   29 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45