Submission #969849

#	Time	Username	Problem	Language	Result	Execution time	Memory
969849		europium	Road Closures (APIO21_roads)	C++17	Compilation error	0 ms	0 KiB

roads

#include "roads.h"

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

using namespace std;
using ll = long long;

void dfs(int node, int parent, int k, vector<vector<pair<int, int>>>& graph, vector<vector<int>>& dp) {
    dp[node][0] = 0;
    dp[node][1] = 0;
    for (auto& edge : graph[node]) {
        int child = edge.first;
        int cost = edge.second;
        if (child == parent) {
            continue;
        }
        dfs(child, node, k, graph, dp);
        for (int i = k; i >= 0; --i) {
            dp[node][i] += min(dp[child][min(i, k)] , dp[child][0]);
        }
    }
}

vector<ll> minimum_closure_costs(int N, vector<int>& U, vector<int>& V, vector<int>& W) {
    vector<vector<pair<int, int>>> graph(N);
    for (int i = 0; i < N - 1; ++i) {
        graph[U[i]].push_back({V[i], W[i]});
        graph[V[i]].push_back({U[i], W[i]});
    }

    vector<vector<ll>> dp(N, vector<ll>(N + 1, numeric_limits<ll>::max()));

    vector<ll> result;
    for (int k = 0; k < N; ++k) {
        dfs(0, -1, k, graph, dp);
        result.push_back(dp[0][k]);
    }

    return result;
}

Compilation message (stderr)

roads.cpp: In function 'void dfs(int, int, int, std::vector<std::vector<std::pair<int, int> > >&, std::vector<std::vector<int> >&)':
roads.cpp:14:13: warning: unused variable 'cost' [-Wunused-variable]
   14 |         int cost = edge.second;
      |             ^~~~
roads.cpp: In function 'std::vector<long long int> minimum_closure_costs(int, std::vector<int>&, std::vector<int>&, std::vector<int>&)':
roads.cpp:36:30: error: invalid initialization of reference of type 'std::vector<std::vector<int> >&' from expression of type 'std::vector<std::vector<long long int> >'
   36 |         dfs(0, -1, k, graph, dp);
      |                              ^~
roads.cpp:9:99: note: in passing argument 5 of 'void dfs(int, int, int, std::vector<std::vector<std::pair<int, int> > >&, std::vector<std::vector<int> >&)'
    9 | void dfs(int node, int parent, int k, vector<vector<pair<int, int>>>& graph, vector<vector<int>>& dp) {
      |                                                                              ~~~~~~~~~~~~~~~~~~~~~^~