Submission #1059567

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059567		shiomusubi496	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 KiB

islands

#include "islands.h"

#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rrep(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define rrep2(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); --i)

#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)

using namespace std;

using ll = long long;

template<class T, class U> bool chmin(T& a, const U& b) { return a > b ? a = b, true : false; }
template<class T, class U> bool chmax(T& a, const U& b) { return a < b ? a = b, true : false; }

struct edge {
    int to, idx;
};

using Graph = vector<vector<edge>>;

std::variant<bool, std::vector<int>> find_journey(int N, int M, std::vector<int> U, std::vector<int> V) {
    vector<vector<int>> A(N, vector<int>(N, -1));
    rep (i, M) A[U[i]][V[i]] = i;
    if (N == 2) return false;
    return {A[0][1], A[1][0], A[0][2], A[2][0], A[1][0], A[0][1], A[2][0], A[0][2]};
}

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:30:83: error: could not convert '{(& A.std::vector<std::vector<int> >::operator[](0))->std::vector<int>::operator[](1), (& A.std::vector<std::vector<int> >::operator[](1))->std::vector<int>::operator[](0), (& A.std::vector<std::vector<int> >::operator[](0))->std::vector<int>::operator[](2), (& A.std::vector<std::vector<int> >::operator[](2))->std::vector<int>::operator[](0), (& A.std::vector<std::vector<int> >::operator[](1))->std::vector<int>::operator[](0), (& A.std::vector<std::vector<int> >::operator[](0))->std::vector<int>::operator[](1), (& A.std::vector<std::vector<int> >::operator[](2))->std::vector<int>::operator[](0), (& A.std::vector<std::vector<int> >::operator[](0))->std::vector<int>::operator[](2)}' from '<brace-enclosed initializer list>' to 'std::variant<bool, std::vector<int, std::allocator<int> > >'
   30 |     return {A[0][1], A[1][0], A[0][2], A[2][0], A[1][0], A[0][1], A[2][0], A[0][2]};
      |                                                                                   ^
      |                                                                                   |
      |                                                                                   <brace-enclosed initializer list>