Submission #736359

#	Time	Username	Problem	Language	Result	Execution time	Memory
736359		puppy	Thousands Islands (IOI22_islands)	C++17	5 / 100	44 ms	4084 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>
using namespace std;
std::variant<bool, std::vector<int>> find_journey(
    int N, int M, std::vector<int> U, std::vector<int> V) {
        int a01, a10, a02, a20;
        if (N == 2) return false;
        else {
            for (int i = 0; i < M; i++) {
                if (U[i] == 0) {
                    if (V[i] == 1) a01 = i;
                    else if (V[i] == 2) a02 = i;
                }
                else if (V[i] == 0 && U[i] == 1) a10 = i;
                else if (V[i] == 0 && U[i] == 2) a20 = i;
            }
            return vector<int>({a01, a10, a02, a20, a10, a01, a20, a02});
        }
}

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:19:72: warning: 'a20' may be used uninitialized in this function [-Wmaybe-uninitialized]
   19 |             return vector<int>({a01, a10, a02, a20, a10, a01, a20, a02});
      |                                                                        ^
islands.cpp:19:72: warning: 'a02' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:19:72: warning: 'a10' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:19:72: warning: 'a01' 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