Submission #796271

#	Time	Username	Problem	Language	Result	Execution time	Memory
796271		ln_e	Thousands Islands (IOI22_islands)	C++17	10 / 100	26 ms	5188 KiB

islands

  #include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho
    #include "islands.h"
    using ll=long long;
    using ld=long double;
    int const INF=1000000005;
    ll const LINF=1000000000000000005;
    ll const mod=1000000007;
    ld const PI=3.14159265359;
    ll const MAX_N=3e5+5;
    ld const EPS=0.00000001;
    #pragma GCC optimize("O3")
    #pragma GCC optimize("Ofast")
    #define f first
    #define s second
    #define pb push_back
    #define mp make_pair
    #define endl '\n'
    #define sz(a) (int)a.size()
    #define CODE_START  ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    using namespace std;

std::variant<bool, std::vector<int>> find_journey(
    int N, int M, std::vector<int> U, std::vector<int> V) {
  if (N == 2){
    vector<ll>g[3];
    for(ll i=0;i<M;i++)
    {
      g[U[i]].pb(i);
    }
    if(g[0].size()>=2&&g[1].size()>=1){
      vector<int>ans;
      ans.pb(g[0][0]);
      ans.pb(g[1][0]);
      ans.pb(g[0][1]);
      ans.pb(g[0][0]);
      ans.pb(g[1][0]);
      ans.pb(g[0][1]);
      return ans;
    }else return false;
  }else if(N<=400&&N>=3){
    ll indx[10];
    for(ll i=0;i<M;i++){
      if(U[i]==0&&V[i]==1){
        indx[1]=i;
      }else if(U[i]==1&&V[i]==0){
        indx[2]=i;
      }else if(U[i]==1&&V[i]==2){
        indx[3]=i;
      }else if(U[i]==2&&V[i]==1){
        indx[4]=i;
      }else if(U[i]==0&&V[i]==2){
        indx[5]=i;
      }else if(U[i]==2&&V[i]==0){
        indx[6]=i;
      }
    }
    vector<int>ans;
    ans.pb(indx[1]);
    ans.pb(indx[3]);
    ans.pb(indx[4]);
    ans.pb(indx[1]);
    ans.pb(indx[5]);
    ans.pb(indx[3]);
    ans.pb(indx[4]);
    ans.pb(indx[5]);
    return ans;
  }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:62:11: warning: 'indx[5]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   62 |     ans.pb(indx[5]);
      |     ~~~~~~^~~~~~~~~
islands.cpp:60:11: warning: 'indx[4]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   60 |     ans.pb(indx[4]);
      |     ~~~~~~^~~~~~~~~
islands.cpp:59:11: warning: 'indx[3]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   59 |     ans.pb(indx[3]);
      |     ~~~~~~^~~~~~~~~
islands.cpp:58:11: warning: 'indx[1]' may be used uninitialized in this function [-Wmaybe-uninitialized]
   58 |     ans.pb(indx[1]);
      |     ~~~~~~^~~~~~~~~

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