Submission #1037556

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037556		12345678	Thousands Islands (IOI22_islands)	C++17	5 / 100	20 ms	3160 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>

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) return false;
    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:16:47: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   16 |     return vector<int> {a, b, c, d, b, a, d, c};
      |                                               ^
islands.cpp:16:47: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:16:47: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:16:47: 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