Submission #1077392

#	Time	Username	Problem	Language	Result	Execution time	Memory
1077392		Faisal_Saqib	Thousands Islands (IOI22_islands)	C++17	6.75 / 100	27 ms	5236 KiB

islands

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

std::variant<bool, std::vector<int>> find_journey(int N, int M, std::vector<int> v1, std::vector<int> v2)
{
    if(2<N)
        return true;
  // if (N == 4) {
  //   return std::vector<int>({0, 1, 2, 4, 0, 3, 2, 1, 4, 3});
  // }
  // return false;
    int n=N,m=M;
    map<pair<int,int>,vector<int>> cnt;
    for(int j=0;j<m;j++)
        cnt[{v1[j],v2[j]}].push_back(j);
    if(cnt[{0,1}].size()>=2 and cnt[{1,0}].size()>=1)
    {
        int f=cnt[{0,1}][0];
        int s=cnt[{0,1}][1];
        int th=cnt[{1,0}][0];
        return vector<int>({f,th,s,f,th,s});
    }
    else
    {
        return false;
    }
}

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:14:9: warning: unused variable 'n' [-Wunused-variable]
   14 |     int n=N,m=M;
      |         ^

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