Submission #1078807

#	Time	Username	Problem	Language	Result	Execution time	Memory
1078807		jer033	Thousands Islands (IOI22_islands)	C++17	5 / 100	23 ms	4444 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
#include <variant>
#include <vector>
using namespace std;
using pii = pair<int, int>;

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;
    int b;
    int c;
    int d;
    for (int i=0; i<M; i++)
    {
        if (U[i] == 0)
        {
            if (V[i] == 1)
                a = i;
            else if (V[i] == 2)
                c = i;
        }
        else if (V[i] == 0)
        {
            if (U[i] == 1)
                b = i;
            else if (U[i] == 2)
                d = i;
        }
    }
    vector<int> ans = {a, b, c, d, b, a, d, c};
    return ans;
}

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:32:46: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |     vector<int> ans = {a, b, c, d, b, a, d, c};
      |                                              ^
islands.cpp:32:46: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:32:46: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:32:46: 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