Submission #786410

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
786410	2023-07-18 07:27:14	khshg	Thousands Islands (IOI22_islands)	C++17	22.75 / 100	1081 ms	20260 KiB

islands

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#include "islands.h"
#include<bits/stdc++.h>
using namespace std;
variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
//vector<int> find_journey(int N, int M, vector<int> U, vector<int> V) {
  vector<map<int, vector<int>>> adj(N);
  vector<int> out(N);
  for(int i = 0; i < M; ++i) {
    adj[U[i]][V[i]].push_back(i);
    ++out[U[i]];
  }
  int cur = 0, prev = -1;
  vector<int> way, ans;
  while(1) {
    int cs = out[cur] - (prev != -1);
    if(cs == 0) return false;
    if(cs == 1) {
      for(auto& u : adj[cur]) if(u.first != prev) {
        way.push_back(u.second[0]);
        prev = cur;
        cur = u.first;
        break;
      }
      continue;
    }
    break;
  }
  //return true;
  ans = way;
 
 
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• Subtask 1: 0 / 5
• Subtask 2: 1.75 / 5
• Subtask 3: 21 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 45