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답안 #1064178

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1064178 2024-08-18T10:00:45 Z parsadox2 봉쇄 시간 (IOI23_closing) C++17
0 / 100
 1000 ms 33432 KB 
#include "closing.h"
#include <bits/stdc++.h>
#define F first
#define S second
using namespace std;
const int N = 2e5 + 10;
int n , x , y;
long long dis[2][N] , k , psum[3][N];
vector <pair<int , int>> adj[N];

void Dfs(int v , int ty , int p = -1)
{
    for(auto u : adj[v])  if(u.F != p)
    {
        dis[ty][u.F] = dis[ty][v] + u.S;
        Dfs(u.F , ty , v);
    }
}

bool cmp(int aa , int bb)
{
    return min(dis[0][aa] , dis[1][aa]) < min(dis[0][bb] , dis[1][bb]);
}

long long Get(int l , int r , int ty)
{
    if(l > r)
        return 0;
    long long res = psum[ty][r];
    if(l > 0)
        res -= psum[ty][l - 1];
    return res;
}

int Solve(int l , int r)
{
    long long val = 0;
    int ans = 0;
    val = Get(l , r , 2);
    ans = 2 * (r - l + 1);
    val += Get(x , l , 0);
    ans += max(0 , l - x);
    val += Get(r + 1 , y , 1);
    ans += max(0 , y - r);
    if(val > k)
        return 0;
    int px = min(l , x) - 1 , py = max(r , y) + 1;
    while(px != -1 && py != n)
    {
        if(dis[0][px] <= dis[1][py])
        {
            if(val + dis[0][px] > k)
                break;
            ans++;
            val+= dis[0][px];
            px--;
            continue;
        }
        if(val + dis[1][py] > k)
            break;
        ans++;
        val += dis[1][py];
        py++;
    }
    while(py != n && val + dis[1][py] <= k)
    {
        val += dis[1][py];
        py++;
        ans++;
    }
    while(px != -1 && val + dis[0][px] <= k)
    {
        val += dis[0][px];
        px--;
        ans++;
    }
    return ans;
}

int max_score(int nn, int X, int Y, long long K,
              vector<int> U, vector<int> V, vector<int> W)
{
    n = nn;
    x = X;
    y = Y;
    k = K;
    if(x > y)
        swap(x , y);
    for(int i = 0 ; i < n ; i++)
        adj[i].clear();
    for(int i = 0 ; i < n - 1 ; i++)
    {
        adj[U[i]].push_back(make_pair(V[i] , W[i]));
        adj[V[i]].push_back(make_pair(U[i] , W[i]));
    }
    //cout << x << " " << y << endl;
    dis[0][x] = 0;
    Dfs(x , 0);
    dis[1][y] = 0;
    Dfs(y , 1);
    psum[0][0] = dis[0][0];
    psum[1][0] = dis[1][0];
    psum[2][0] = max(dis[0][0] , dis[1][0]);
    for(int i = 1 ; i < n ; i++)
    {
        psum[0][i] = dis[0][i] + psum[0][i - 1];
        psum[1][i] = dis[1][i] + psum[1][i - 1];
        psum[2][i] = max(dis[0][i] , dis[1][i]) + psum[2][i - 1];
    }
    int ans = 0;
    for(int l = 0 ; l < n ; l++)  for(int r = l ; r < n ; r++)
    {
        ans = max(ans , Solve(l , r));
    }
    vector <long long> all;
    for(int i = 0 ; i < n ; i++)
    {
        //cout << i << " : " << dis[0][i] << " " << dis[1][i] << endl;
        all.push_back(min(dis[0][i] , dis[1][i]));
    }
    sort(all.rbegin() , all.rend());
    int ans2 = 0;
    while(!all.empty() && k >= all.back())
    {
        k -= all.back();
        all.pop_back();
        ans2++;
    }
    return max(ans , ans2);
}

Subtask #0
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 4952 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #1
0.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1070 ms 33432 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Incorrect 2 ms 5092 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
5 Halted 0 ms 0 KB -

Subtask #3
0.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Incorrect 2 ms 5092 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
5 Halted 0 ms 0 KB -

Subtask #4
0.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4952 KB Output is correct
2 Correct 2 ms 4956 KB Output is correct
3 Correct 2 ms 4956 KB Output is correct
4 Incorrect 2 ms 5092 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
5 Halted 0 ms 0 KB -

Subtask #5
0.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 4952 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 4952 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #7
0.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 4952 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #8
0.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 4952 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -

Subtask #9
0.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 4952 KB 1st lines differ - on the 1st token, expected: '6', found: '5'
2 Halted 0 ms 0 KB -