Submission #841105

#	Time	Username	Problem	Language	Result	Execution time	Memory
841105		danikoynov	Closing Time (IOI23_closing)	C++17	9 / 100	48 ms	10032 KiB

closing

#include "closing.h"
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

const int maxn = 3e3 + 10;

vector < pair < int, ll > > adj[maxn];
ll dist[2][maxn];
int n;

void bfs(int s, ll arr[])
{
    queue < int > q;
    for (int i = 0; i < n; i ++)
        arr[i] = -1;

    arr[s] = 0;
    q.push(s);
    while(!q.empty())
    {
        int v = q.front();
        q.pop();
        for (pair < int, ll > nb : adj[v])
        {
            if (arr[nb.first] == -1)
            {
                arr[nb.first] = arr[v] + nb.second;
                q.push(nb.first);
            }
        }
    }
}
const ll inf = 1e18;

ll value[maxn];
ll dp[maxn][maxn], sub[maxn], temp[maxn];
void dfs(int v, int par)
{
    sub[v] = 1;
    for (pair < int, ll > nb : adj[v])
    {
        if (nb.first == par)
            continue;
        dfs(nb.first, v);
    }


    dp[v][0] = 0;
    dp[v][1] = max((ll)(0), dist[1][v] - value[v]);

    for (pair < int, ll > nb : adj[v])
    {
        if (nb.first == par)
            continue;
            int u = nb.first;
        for (int i = 0; i <= sub[u] + sub[v]; i ++)
            temp[i] = inf;

            for (int i = 0; i <= sub[v]; i ++)
                for (int j = 0; j <= sub[u]; j ++)
            {
                if (i == 0 && j > 0)
                    continue;
                temp[i + j] = min(temp[i + j], dp[v][i] + dp[u][j]);
            }

            for (int i = 0; i <= sub[v] + sub[u]; i ++)
                dp[v][i] = temp[i];
            sub[v] += sub[u];
    }
}

int max_score(int N, int X, int Y, long long K,
              vector<int> U, vector<int> V, vector<int> W)
{
    for (int i = 0; i < N; i ++)
    {
        dist[0][i] = dist[1][i] = 0;
        adj[i].clear();
        value[i] = 0;
    }
    n = N;
    for (int i = 0; i < N - 1; i ++)
    {
        adj[U[i]].push_back({V[i], W[i]});
        adj[V[i]].push_back({U[i], W[i]});
    }

    bfs(X, dist[0]);
    bfs(Y, dist[1]);

    vector < pair < ll, int > > ord;
    ll left_k = K;
    for (int i = 0; i < N; i ++)
    {
        ord.push_back({dist[0][i], i});
    }

    sort(ord.begin(), ord.end());
    ///for (int i = 0; i < ord.size(); i ++)
       /// cout << "here " << ord[i].first << " " << ord[i].second << endl;
    ll ans = 0;
    for (int i = 0; i < ord.size(); i ++)
    {
        left_k = left_k - ord[i].first;
        if (left_k < 0)
            break;


        value[ord[i].second] = ord[i].first;
        dfs(Y, -1);
        /**cout << "step " << i + 1 << " " << left_k << endl;
        for (int j = 0; j <= N; j ++)
            cout << dp[Y][j] << " ";
        cout << endl;*/
        ll cur = 0;
        int j = 0;
        while(j <= n && dp[Y][j] <= left_k)
            j ++;
        j --;
        cur = i + 1 + j;
        if (cur > ans)
            ans = cur;
    }
    return ans;
}

Compilation message (stderr)

closing.cpp: In function 'void dfs(int, int)':
closing.cpp:55:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   55 |         if (nb.first == par)
      |         ^~
closing.cpp:57:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   57 |             int u = nb.first;
      |             ^~~
closing.cpp:58:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   58 |         for (int i = 0; i <= sub[u] + sub[v]; i ++)
      |         ^~~
closing.cpp:61:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   61 |             for (int i = 0; i <= sub[v]; i ++)
      |             ^~~
closing.cpp: In function 'int max_score(int, int, int, long long int, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:105:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |     for (int i = 0; i < ord.size(); i ++)
      |                     ~~^~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 8
• Subtask 2: 9 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17