Submission #1223387

#	Time	Username	Problem	Language	Result	Execution time	Memory
1223387		SpyrosAliv	Road Closures (APIO21_roads)	C++20	Compilation error	0 ms	0 KiB

roads

#include "roads.h"
using namespace std;
#define ll long long

const ll INF = 1e17;
vector<vector<pair<int, ll>>> tree;
vector<vector<ll>> dp;
int n;

void dfs(int node, int par = 0) {
    for (auto [next, w]: tree[node]) {
        if (next == par) continue;
        dfs(next, node);
    }
    for (int k = 0; k <= n; k++) {
        ll ans = 0;
        if (k == 0) {
            for (auto [next, w]: tree[node]) {
                if (next == par) continue;
                ans += w;
            }
            dp[node][k] = ans;
            continue;
        }   
        vector<ll> ops;
        for (auto [next, w]: tree[node]) {
            if (next == par) continue;
            ops.push_back(dp[next][k] - (dp[next][k-1] + w));
            ans += dp[next][k-1] + w;
        }
        sort(ops.begin(), ops.end());
        if (ops.size() < k) {
            break;
        }
        for (int j = 0; j < k; j++) {
            ans += ops[j];
        }
        dp[node][k] = ans;
    }
}

vector<ll> minimum_closure_costs(int N, vector<int> U, vector<int> V, vector<int> W) {
    n = N;
    tree.resize(n+1);
    for (int i = 0; i < n; i++) {
        U[i]++;
        V[i]++;
        tree[U[i]].push_back({V[i], W[i]});
        tree[V[i]].push_back({U[i], W[i]});
    }
    dp.assign(n+1, vector<ll>(n+1, INF));
    dfs(1);
    vector<ll> ans;
    for (int k = 1; k <= n; k++) dp[1][k] = min(dp[1][k], dp[1][k-1]);
    for (int k = 0; k <= n; k++) ans.push_back(dp[1][i]);
    return ans;
}

Compilation message (stderr)

roads.cpp: In function 'std::vector<long long int> minimum_closure_costs(int, std::vector<int>, std::vector<int>, std::vector<int>)':
roads.cpp:55:54: error: 'i' was not declared in this scope
   55 |     for (int k = 0; k <= n; k++) ans.push_back(dp[1][i]);
      |                                                      ^