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Submission #156805

# Submission time Handle Problem Language Result Execution time Memory
156805 2019-10-07T13:27:09 Z Alexa2001 Factories (JOI14_factories) C++17
100 / 100
 7593 ms 338620 KB 
#include "factories.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> Pair;

const int Nmax = 5e5 + 5;
const ll lim = 1e17;

vector<ll> h[Nmax];
vector<int> root[Nmax];
vector<int> v[Nmax], c[Nmax];

int w[Nmax];
bool used[Nmax];
int n, All;
ll best[Nmax];
int up[Nmax], worst[Nmax];
vector<int> nodes;


void dfs0(int node, int dad = -1)
{
    w[node] = 1;
    nodes.push_back(node);

    for(auto it : v[node])
        if(!used[it] && it!=dad)
        {
            dfs0(it, node);
            worst[node] = max(worst[node], w[it]);
            w[node] += w[it];
        }
}

void dfs(int node, int dad = -1)
{
    int i;
    for(i=0; i<v[node].size(); ++i)
    {
        int son, cost;
        son = v[node][i], cost = c[node][i];

        if(used[son] || son == dad) continue;

        h[son].push_back(h[node].back() + cost);
        root[son].push_back(root[node].back());

        dfs(son, node);
    }
}

void build(int node)
{
    nodes.clear();
    dfs0(node);
    All = w[node];

    Pair centroid = {All, All};
    for(auto &it : nodes)
        centroid = min(centroid, { max(worst[it], All - w[it]), it });
    node = centroid.second;

    for(auto &it : nodes) worst[it] = 0;

    h[node].push_back(0);
    root[node].push_back(node);
    dfs(node);

    used[node] = 1;

    for(auto it : v[node])
        if(!used[it])
            build(it);
}

void Init(int N, int A[], int B[], int D[])
{
    n = N;
    int i;

    for(i=0; i<n-1; ++i)
    {
        v[A[i]].push_back(B[i]);
        v[B[i]].push_back(A[i]);
        c[A[i]].push_back(D[i]);
        c[B[i]].push_back(D[i]);
    }

    for(i=0; i<n; ++i) best[i] = lim;

    build(0);
}

static void min_to(ll &x, ll y)
{
    if(x > y) x = y;
}

ll Query(int S, int X[], int T, int Y[])
{
    int i, j;
    vector<pair<int,ll>> S1, S2;

    for(i=0; i<S; ++i)
    {
        int node = X[i];

        for(j=0; j<root[node].size(); ++j)
            min_to( best[root[node][j]], h[node][j] );
    }

    ll ans = lim;

    for(i=0; i<T; ++i)
    {
        int node = Y[i];

        for(j=0; j<root[node].size(); ++j)
            min_to(ans, best[root[node][j]] + h[node][j] );
    }

    for(i=0; i<S; ++i)
    {
        int node = X[i];

        for(j=0; j<root[node].size(); ++j)
            best[root[node][j]] = lim;
    }

    return ans;
}

Compilation message

factories.cpp: In function 'void dfs(int, int)':
factories.cpp:41:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0; i<v[node].size(); ++i)
              ~^~~~~~~~~~~~~~~
factories.cpp: In function 'll Query(int, int*, int, int*)':
factories.cpp:111:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(j=0; j<root[node].size(); ++j)
                  ~^~~~~~~~~~~~~~~~~~
factories.cpp:121:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(j=0; j<root[node].size(); ++j)
                  ~^~~~~~~~~~~~~~~~~~
factories.cpp:129:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(j=0; j<root[node].size(); ++j)
                  ~^~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 47736 KB Output is correct
2 Correct 458 ms 56540 KB Output is correct
3 Correct 487 ms 56940 KB Output is correct
4 Correct 484 ms 56952 KB Output is correct
5 Correct 526 ms 57320 KB Output is correct
6 Correct 391 ms 56184 KB Output is correct
7 Correct 481 ms 56844 KB Output is correct
8 Correct 492 ms 56952 KB Output is correct
9 Correct 527 ms 57380 KB Output is correct
10 Correct 392 ms 56160 KB Output is correct
11 Correct 487 ms 56856 KB Output is correct

Subtask #2
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 47612 KB Output is correct
2 Correct 4130 ms 206224 KB Output is correct
3 Correct 6035 ms 258172 KB Output is correct
4 Correct 1555 ms 136796 KB Output is correct
5 Correct 6832 ms 323084 KB Output is correct
6 Correct 6225 ms 271424 KB Output is correct
7 Correct 1450 ms 100916 KB Output is correct
8 Correct 680 ms 86376 KB Output is correct
9 Correct 1717 ms 113684 KB Output is correct
10 Correct 1390 ms 102140 KB Output is correct

Subtask #3
67.0 / 67.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 47736 KB Output is correct
2 Correct 458 ms 56540 KB Output is correct
3 Correct 487 ms 56940 KB Output is correct
4 Correct 484 ms 56952 KB Output is correct
5 Correct 526 ms 57320 KB Output is correct
6 Correct 391 ms 56184 KB Output is correct
7 Correct 481 ms 56844 KB Output is correct
8 Correct 492 ms 56952 KB Output is correct
9 Correct 527 ms 57380 KB Output is correct
10 Correct 392 ms 56160 KB Output is correct
11 Correct 487 ms 56856 KB Output is correct
12 Correct 48 ms 47612 KB Output is correct
13 Correct 4130 ms 206224 KB Output is correct
14 Correct 6035 ms 258172 KB Output is correct
15 Correct 1555 ms 136796 KB Output is correct
16 Correct 6832 ms 323084 KB Output is correct
17 Correct 6225 ms 271424 KB Output is correct
18 Correct 1450 ms 100916 KB Output is correct
19 Correct 680 ms 86376 KB Output is correct
20 Correct 1717 ms 113684 KB Output is correct
21 Correct 1390 ms 102140 KB Output is correct
22 Correct 4724 ms 217528 KB Output is correct
23 Correct 4928 ms 221700 KB Output is correct
24 Correct 7176 ms 271520 KB Output is correct
25 Correct 6857 ms 275804 KB Output is correct
26 Correct 6910 ms 271828 KB Output is correct
27 Correct 7593 ms 338620 KB Output is correct
28 Correct 2172 ms 153684 KB Output is correct
29 Correct 6476 ms 272244 KB Output is correct
30 Correct 6679 ms 272520 KB Output is correct
31 Correct 6778 ms 272500 KB Output is correct
32 Correct 1783 ms 114456 KB Output is correct
33 Correct 825 ms 87160 KB Output is correct
34 Correct 1187 ms 96204 KB Output is correct
35 Correct 1225 ms 96736 KB Output is correct
36 Correct 1504 ms 100100 KB Output is correct
37 Correct 1552 ms 99956 KB Output is correct