Submission #1074286

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074286		fv3	Thousands Islands (IOI22_islands)	C++17	5 / 100	31 ms	4440 KiB

islands

#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) 
{
  if (N < 3)
    return false;

  int s_out, s_in;
  for (int i = 0; i < M; i++)
  {
    if (U[i] == 0)
    {
      s_out = i;
      for (int j = 0; j < M; j++)
      {
        if (U[j] != V[i] || V[j] != 0) continue;
        s_in = j;
        break;
      }
      break;
    }
  }

  int e_out, e_in;
  for (int i = s_out + 1; i < M; i++)
  {
    if (U[i] == 0)
    {
      e_out = i;
      for (int j = 0; j < M; j++)
      {
        if (U[j] != V[i] || V[j] != 0) continue;
        e_in = j;
        break;
      }
      break;
    }
  }

  return vector<int>({s_out, s_in, e_out, e_in, s_in, s_out, e_in, e_out});
}

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:28:12: warning: 's_out' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |   for (int i = s_out + 1; i < M; i++)
      |            ^
islands.cpp:43:74: warning: 'e_in' may be used uninitialized in this function [-Wmaybe-uninitialized]
   43 |   return vector<int>({s_out, s_in, e_out, e_in, s_in, s_out, e_in, e_out});
      |                                                                          ^
islands.cpp:43:74: warning: 'e_out' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:43:74: warning: 's_in' may be used uninitialized in this function [-Wmaybe-uninitialized]

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