Submission #632177

#	Time	Username	Problem	Language	Result	Execution time	Memory
632177		Minindu2006	Thousands Islands (IOI22_islands)	C++17	10 / 100	32 ms	5068 KiB

islands

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

int n, m;
vector<int> u, v;
std::variant<bool, std::vector<int>> find_journey(int N, int M, std::vector<int> U, std::vector<int> V) {
  n = N, m = M;
  u = U, v = V;
  vector<int> ans;
  if(n <= 2)
  {
    if(m <= 2)
      return false;
    int z = 0;
    vector<int> cur(3);
    for(int i=0;i<m;i++)
    {
      if(u[i] == 0)
      {
        if(z < 2)
          cur[z] = i;
        z++;
      }
      else
        cur[2] = i;
    }
    if(z < 2 || z == m)
      return false;
    ans.resize(3);
    ans[0] = cur[0];
    ans[1] = cur[2];
    ans[2] = cur[1];
    for(int i=0;i<3;i++)
      ans.push_back(ans[i]);
    return ans;
  }
  int a, b, c, d;
  for(int i=0;i<m;i++)
  {
    if(u[i] == 0 && v[i] == 1)
      a = i;
    if(u[i] == 1 && v[i] == 0)
      b = i;
    if(u[i] == 0 && v[i] == 2)
      c = i;
    if(u[i] == 2 && v[i] == 0)
      d = i;
  }
  return vector<int> ({a, b, c, d, b, a, d, c});
}

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:52:47: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |   return vector<int> ({a, b, c, d, b, a, d, c});
      |                                               ^
islands.cpp:52:47: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:52:47: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:52:47: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]

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