Submission #563769

#	Time	Username	Problem	Language	Result	Execution time	Memory
563769		pvpwarrior	Road Closures (APIO21_roads)	C++14	0 / 100	2057 ms	21192 KiB

roads

#include "roads.h"
#include <bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define ll long long
#define vi std::vector<ll>
#define si set<ll>
#define INF 100000000
#define pb push_back
#define mod 1000000007

std::vector<long long> minimum_closure_costs(int N, std::vector<int> U,
                                             std::vector<int> V,
                                             std::vector<int> W) {
    ll n = N;
    set<pair < ll, ll > > adj[n];
    // for (int i = 0; i < n-1; ++i){
    //     cin >> u[i] >> v[i] >> w[i];
    // }
    // for (int i = 0; i < n; ++i){
    //     cin >> v[i];
    // }
    // for (int i = 0; i < n; ++i){
    //     cin >> w[i];
    // }
    for (int i = 0; i < n-1; ++i){
        adj[V[i]].insert(make_pair(W[i] , U[i]));
        adj[U[i]].insert(make_pair(W[i] , V[i]));
    }

    // for (int i = 0; i < n; ++i)
    // {
    //     cout << i << ": ";
    //     for(auto x: adj[i]){
    //         cout << "(" << x.first << ", " << x.second << "), ";
    //     }
    //     cout << "\n";
    // }

    vi ans(n,0);
    ll sum = 0;
    for (int k = n-1; k >= 0; k--){
        sum = 0;
        // cout << k << " :\n";
        for (int i = 0; i < n; ++i){
            while(adj[i].size() > k){

                auto it = adj[i].begin();
                pair <ll ,ll > x = *it;

                sum += x.first;

                ll in = x.second;
                auto it2 = adj[in].find(make_pair(x.first, i));
                pair <ll ,ll > y = *it2;
                adj[x.second].erase(it2);
                // return 0;
                // cout << x.first << " " << x.second << "\n";
                // cout << y.first << " " << y.second << "\n";
                adj[i].erase(it);
                // cout << "\n";
            }
            // cout << "\n";
        }
        // cout << "\n";
        if(n-1-k) ans[n-1-k]=ans[n-k-2];
        ans[n-1-k] += sum;
    }

    // for (int i = n-1; i >= 0; i--){
    //     cout << ans[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:46:33: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   46 |             while(adj[i].size() > k){
      |                   ~~~~~~~~~~~~~~^~~
roads.cpp:55:32: warning: variable 'y' set but not used [-Wunused-but-set-variable]
   55 |                 pair <ll ,ll > y = *it2;
      |                                ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 14
• Subtask 4: 0 / 10
• Subtask 5: 0 / 17
• Subtask 6: 0 / 25
• Subtask 7: 0 / 22