Submission #786242

#	Time	Username	Problem	Language	Result	Execution time	Memory
786242		vjudge1	Thousands Islands (IOI22_islands)	C++17	10 / 100	25 ms	4436 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) {
        vector<int> f0, f1;
        for (int i = 0; i < M; i++) {
            (U[i] == 0 ? f0 : f1).push_back(i);
        }
        if (f0.size() < 2 || f1.size() < 1) {
            return false;
        }
        return vector{f0[0], f1[0], f0[1], f0[0], f1[0], f0[1]};
    }
    int a, b, c, d;
    for (int i = 0; i < M; i++) {
        if (U[i] == 0) {
            if (V[i] == 1) {
                a = i;
            }
            if (V[i] == 2) {
                c = i;
            }
        }
        if (V[i] == 0) {
            if (U[i] == 1) {
                b = i;
            }
            if (U[i] == 2) {
                d = i;
            }
        }
    }
    return vector{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:34:41: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
   34 |     return vector{a, b, c, d, b, a, d, c};
      |                                         ^
islands.cpp:34:41: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:34:41: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
islands.cpp:34:41: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]

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