Submission #1028234

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028234		42kangaroo	Thousands Islands (IOI22_islands)	C++17	Compilation error	0 ms	0 KiB

islands

#include "islands.h"

#include <variant>
#include <vector>
#include "bits/stdc++.h"

using namespace std;

using g_t = vector<vector<pair<int,int>>>;

int dfs(int n, int d, int p, g_t& g, vector<bool>& vis, vector<int>& re) {
	vis[n] = true;
	for (auto [ne, nu]: g[n]) {
		if (vis[ne]) {
			re.push_back(nu);
			return ne;
		}
		int res = dfs(ne, nu, g, vis, re);
		if (re.empty()) continue;
		re.push_back(nu);
		if (res == n) {
			re.push_back(-1);
			return -2;
		}
		return res;
	}
	return -2;
}

std::variant<bool, std::vector<int>> find_journey(
		int N, int M, std::vector<int> U, std::vector<int> V) {
	if (N == 2) {
		vector<int> s0, s1;
		for (int i = 0; i < M; ++i) {
			if (U[i] == 0) s0.push_back(i);
			else s1.push_back(i);
		}
		if (s0.size() >= 2 && s1.size() >= 1) {
			return vector<int>{s0[0], s1[0], s0[1], s0[0], s1[0], s0[1]};
		} else return false;
	}
	g_t g(N);
	int s01, s10, s21, s02;
	for (int i = 0; i < M; ++i) {
		if (U[i] == 0 && V[i] == 1) s01 = i;
		if (U[i] == 1 && V[i] == 0) s10 = i;
		if (U[i] == 2 && V[i] == 1) s21 = i;
		if (U[i] == 0 && V[i] == 2) s02 = i;
	}
	return vector<int>{s02, s21, s10, s01, s21, s02, s10, s01};
}

Compilation message (stderr)

islands.cpp: In function 'int dfs(int, int, int, g_t&, std::vector<bool>&, std::vector<int>&)':
islands.cpp:18:25: error: cannot convert 'g_t' {aka 'std::vector<std::vector<std::pair<int, int> > >'} to 'int'
   18 |   int res = dfs(ne, nu, g, vis, re);
      |                         ^
      |                         |
      |                         g_t {aka std::vector<std::vector<std::pair<int, int> > >}
islands.cpp:11:27: note:   initializing argument 3 of 'int dfs(int, int, int, g_t&, std::vector<bool>&, std::vector<int>&)'
   11 | int dfs(int n, int d, int p, g_t& g, vector<bool>& vis, vector<int>& re) {
      |                       ~~~~^