Submission #1070359

#	Time	Username	Problem	Language	Result	Execution time	Memory
1070359		Unforgettablepl	Thousands Islands (IOI22_islands)	C++17	5 / 100	38 ms	3156 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==2)return false;
    vector<vector<pair<int,int>>> adj(N);
    int a,aXOR,b,bXOR;
    for(int i=0;i<M;i++){
        if(U[i]==0 and V[i]==1)a=i;
        else if(U[i]==1 and V[i]==0)aXOR=i;
        else if(U[i]==0 and V[i]==2)b=i;
        else if(U[i]==2 and V[i]==0)bXOR=i;
    }
    return vector({a,aXOR,b,bXOR,aXOR,a,bXOR,b});
}

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:15:48: warning: 'bXOR' may be used uninitialized in this function [-Wmaybe-uninitialized]
   15 |     return vector({a,aXOR,b,bXOR,aXOR,a,bXOR,b});
      |                                                ^
islands.cpp:15:48: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:15:48: warning: 'aXOR' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:15:48: warning: 'a' 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