Submission #1076444

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076444		zsombor	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 KiB

islands

#include "islands.h"
#include <bits/stdc++.h>
#include <variant>
using namespace std;

int n, m;
vector<int> u;
vector<int> v;
vector<int> ans;

void solve1() {
    vector<int> a;
    vector<int> b;
    for (int i = 0; i < m; i++) {
        if (!u[i]) b.push_back(i);
        else a.push_back(i);
    }
    if (a.size() < 2 || b.size() < 2) return;
    ans = {a[0], b[0], a[1], b[1], b[0], a[0], b[1], a[1]};
}

variant<bool, vector<int> > find_journey(int N, int M, vector<int> U, vector<int> V) {
    n = N;
    m = M;
    u = U;
    v = V;
    if (n == 2) solve1();
    return (ans.size() ? ans : false);
}

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:28:24: error: operands to '?:' have different types 'std::vector<int>' and 'bool'
   28 |     return (ans.size() ? ans : false);
      |             ~~~~~~~~~~~^~~~~~~~~~~~~