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Submission #839577

# Submission time Handle Problem Language Result Execution time Memory
839577 2023-08-30T09:00:08 Z model_code Truck Driver (IOI23_deliveries) C++17
43 / 100
 4500 ms 21628 KB 
// time_limit/sol_vp_brute_force.cpp

#include "deliveries.h"
#include <algorithm>
#include <vector>
#include <iostream>

using namespace std;

vector<vector<pair<int, long long>>> g;
vector<long long> weight, sz;
vector<int> up, height, cnt;
vector<bool> vis;

pair<int, int> dfs0(int x, int p, int d){
    vis[x] = true;
    up[x] = p;
    pair<int, int> res = {d, x};
    for(auto [y, w] : g[x]){
        if(!vis[y]){
            res = max(res, dfs0(y, x, d+1));
        }
    }
    return res;
}

void dfs(int x, int p, int w_ = 0){
    vis[x] = true;
    weight[x] = w_;
    up[x] = p;
    sz[x] = cnt[x];
    height[x] = 0;
    for(auto [y, w] : g[x]){
        if(!vis[y]){
            dfs(y, x, w);
            sz[x] += sz[y];
            height[x] = max(height[x], height[y] + 1);
        }
    }
}

long long weight_sum = 0;
int C;

void update(int x, int c){
    cnt[x] += c;
    while(x != -1){
        sz[x] += c;
        weight_sum += weight[x] * c;
        x = up[x];
    }
}

int get_c(int x, long long m){
    for(auto [y, w] : g[x]){
        if(up[y] == x && sz[y]*2 > m){
            return get_c(y, m);
        }
    }
    return x;
}

void print(){
    for(int i = 0; i < (int)g.size(); i++){
        cout << "i: " << i << " sz: " << sz[i] << " w: " << weight[i] << " up: " << up[i] << " cnt: " << cnt[i] << endl;
    }
}

void init(int N, std::vector<int> U, std::vector<int> V, std::vector<int> T, std::vector<int> W) {
	g.resize(N);
    sz.assign(N, 0);
    up.assign(N, 0);
    height.assign(N, 0);
    weight.assign(N, 0);
    cnt = W;
    cnt[0]++;
    for(int i = 0; i < N-1; i++){
        g[U[i]].emplace_back(V[i], T[i]);
        g[V[i]].emplace_back(U[i], T[i]);
    }

    vis.assign(N, false);
    int tmp = dfs0(0, -1, 0).second;
    vis.assign(N, false);
    auto [d, s] = dfs0(tmp, -1, 0);

    for(int i = 0; i < d/2; i++) s = up[s];

    vis.assign(N, false);
    dfs(s, -1);
    C = s;

    for(int i = 0; i < N; i++){
        weight_sum += sz[i] * weight[i];
    }

    // cout << "C: " << C << endl;
    // cout << "weight sum: " << weight_sum << endl;

    return;
}

long long max_time(int S, int X) {
    if(S == 0) X++;
	update(S, X - cnt[S]);

    int c = get_c(C, sz[C]);

    // cout << "centroid: " << c << endl;
    // print();

    long long res = weight_sum;
    while(c != -1){
        res += (sz[C] - sz[c] * 2) * weight[c];
        c = up[c];
    }

    return res * 2;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 7644 KB Output is correct
2 Correct 75 ms 7384 KB Output is correct
3 Correct 71 ms 7636 KB Output is correct
4 Correct 71 ms 7500 KB Output is correct
5 Correct 76 ms 7636 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 2 ms 428 KB Output is correct
4 Correct 2 ms 456 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 3 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 2 ms 468 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 3 ms 472 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 2 ms 340 KB Output is correct
13 Correct 2 ms 340 KB Output is correct
14 Correct 3 ms 468 KB Output is correct
15 Correct 3 ms 468 KB Output is correct

Subtask #3
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 7644 KB Output is correct
2 Correct 75 ms 7384 KB Output is correct
3 Correct 71 ms 7636 KB Output is correct
4 Correct 71 ms 7500 KB Output is correct
5 Correct 76 ms 7636 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 2 ms 468 KB Output is correct
8 Correct 17 ms 2396 KB Output is correct
9 Correct 256 ms 20292 KB Output is correct
10 Correct 233 ms 20172 KB Output is correct
11 Correct 216 ms 20220 KB Output is correct
12 Correct 142 ms 21628 KB Output is correct
13 Correct 151 ms 21584 KB Output is correct
14 Correct 137 ms 21580 KB Output is correct

Subtask #4
0.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 7644 KB Output is correct
2 Correct 75 ms 7384 KB Output is correct
3 Correct 71 ms 7636 KB Output is correct
4 Correct 71 ms 7500 KB Output is correct
5 Correct 76 ms 7636 KB Output is correct
6 Correct 1 ms 232 KB Output is correct
7 Correct 6 ms 468 KB Output is correct
8 Correct 466 ms 2772 KB Output is correct
9 Execution timed out 4585 ms 21016 KB Time limit exceeded
10 Halted 0 ms 0 KB -

Subtask #5
0.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 7644 KB Output is correct
2 Correct 75 ms 7384 KB Output is correct
3 Correct 71 ms 7636 KB Output is correct
4 Correct 71 ms 7500 KB Output is correct
5 Correct 76 ms 7636 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 428 KB Output is correct
9 Correct 2 ms 456 KB Output is correct
10 Correct 2 ms 468 KB Output is correct
11 Correct 3 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 2 ms 468 KB Output is correct
14 Correct 2 ms 468 KB Output is correct
15 Correct 3 ms 472 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 3 ms 468 KB Output is correct
20 Correct 3 ms 468 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 2 ms 468 KB Output is correct
23 Correct 17 ms 2396 KB Output is correct
24 Correct 256 ms 20292 KB Output is correct
25 Correct 233 ms 20172 KB Output is correct
26 Correct 216 ms 20220 KB Output is correct
27 Correct 142 ms 21628 KB Output is correct
28 Correct 151 ms 21584 KB Output is correct
29 Correct 137 ms 21580 KB Output is correct
30 Correct 1 ms 232 KB Output is correct
31 Correct 6 ms 468 KB Output is correct
32 Correct 466 ms 2772 KB Output is correct
33 Execution timed out 4585 ms 21016 KB Time limit exceeded
34 Halted 0 ms 0 KB -