oj.uz

Submission #1002389

# Submission time Handle Problem Language Result Execution time Memory
1002389 2024-06-19T14:05:02 Z yoav_s Spring cleaning (CEOI20_cleaning) C++17
53 / 100
 1000 ms 46704 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")

using namespace std;

typedef int ll;
typedef vector<ll> v;
typedef vector<v> vv;
typedef vector<vv> vvv;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;
typedef pair<ll,ll> p;
typedef vector<p> vp;
typedef vector<vp> vvp;
typedef vector<vvp> vvvp;
typedef pair<ll, p> tri;
typedef vector<tri> vtri;
typedef vector<vtri> vvtri;
typedef vector<vvtri> vvvtri;

#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()

const ll INF = 1e18;
const ll mod = 1e9 + 7;
#define set unordered_set

ll getLeafCount(ll i, vv &graph, v &res)
{
    if (res[i] != -1) return 0;
    res[i] = 0;
    if (graph[i].size() == 1)
    {
        res[i] = 1;
        return 1;
    }
    for (ll x : graph[i]) res[i] += getLeafCount(x, graph, res);
    return res[i];
}

void getOddAndEvenParents(ll i, vv &graph, v &oddRes, v &evenRes, ll oddParents, ll evenParents, v &parity)
{
    if (oddRes[i] != -1) return;
    if (parity[i] % 2 == 0) evenParents++;
    else oddParents++;
    oddRes[i] = oddParents;
    evenRes[i] = evenParents;
    for (ll x : graph[i]) getOddAndEvenParents(x, graph, oddRes, evenRes, oddParents, evenParents, parity);
}

set<ll> solve(ll i, vv &graph, vb &visited, v &res, vv &changes, v &oddParents, v &evenParents)
{
    visited[i] = true;
    vector<set<ll>> childrenSets;
    for (ll x : graph[i])
    {
        if (visited[x]) continue;
        childrenSets.pb(solve(x, graph, visited, res, changes, oddParents, evenParents));
    }
    childrenSets.pb(set<ll>());
    for (ll x : changes[i])
    {
        childrenSets.back().insert(x);
        res[x] += oddParents[i] - evenParents[i];
    }
    set<ll> baseSet;
    ll maxiSize = -1;
    ll index = -1;
    for (ll i = 0; i < childrenSets.size(); i++)
    {
        if (childrenSets[i].size() > maxiSize)
        {
            baseSet = childrenSets[i];
            maxiSize = childrenSets[i].size();
            index = i;
        }
    }
    set<ll> newAdditions;
    for (ll j = 0; j < childrenSets.size(); j++)
    {
        if (j == index) continue;
        for (auto y : childrenSets[j])
        {
            if (baseSet.count(y) > 0)
            {
                res[y] -= oddParents[i] - evenParents[i];
            }
            else
            {
                baseSet.insert(y);
                newAdditions.insert(y);
            }
        }
    }
    for (ll x : newAdditions) baseSet.erase(x);
    set<ll> done;
    for (ll j = 0; j < childrenSets.size(); j++)
    {
        if (j == index) continue;
        for (auto y : childrenSets[j])
        {
            if (baseSet.count(y) > 0)
            {
                baseSet.erase(y);
                done.insert(y);
                res[y] += evenParents[i] - oddParents[i];
            }
            else
            {
                baseSet.insert(y);
                if (done.count(y) > 0)
                    res[y] += oddParents[i] - evenParents[i];
            }
        }
    }
    return baseSet;
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    ll N, Q;
    cin >> N >> Q;
    vv graph(N);
    for (ll i = 0; i < N - 1; i++)
    {
        ll a, b;
        cin >> a >> b; a--; b--;
        graph[a].pb(b);
        graph[b].pb(a);
    }
    ll root = 0;
    while (graph[root].size() == 1) root++;
    v leafCount(N, -1);
    getLeafCount(root, graph, leafCount);
    v oddParents(N, -1), evenParents(N, -1);
    getOddAndEvenParents(root, graph, oddParents, evenParents, 0, 0, leafCount);
    vv queries(Q);
    for (ll i = 0; i < Q; i++)
    {
        ll amt;
        cin >> amt;
        for (ll j=  0; j < amt; j++)
        {
            ll par;
            cin >> par;
            par--;
            queries[i].pb(par);
        }
    }
    vv changedInQueries(N);
    for (ll i = 0 ;i < Q; i++)
    {
        map<ll, ll> changed;
        
        for (ll x : queries[i])
        {
            changed[x]++;
        }
        for (auto x : changed)
        {
            if ((x.s % 2 == 1) ^ (graph[x.f].size() == 1)) changedInQueries[x.f].pb(i);
        }
    }
    v addToQuery(Q);
    ll base = N - 2;
    for (ll i = 0 ;i < N; i++) if (leafCount[i] % 2 == 0) base++;
    vb visited(N, false);
    solve(root, graph, visited, addToQuery, changedInQueries, oddParents, evenParents);
    for (ll i = 0; i < Q; i++)
    {
        ll count = leafCount[root] + queries[i].size();
        set<ll> changed;
        for (ll x : queries[i]) if (graph[x].size() == 1) changed.insert(x);
        count -= changed.size();
        if (count % 2 == 1) cout << "-1\n";
        else cout << base + queries[i].size() + addToQuery[i] << "\n";
    }
    return 0;
}

Compilation message

cleaning.cpp:28:16: warning: overflow in conversion from 'double' to 'll' {aka 'int'} changes value from '1.0e+18' to '2147483647' [-Woverflow]
   28 | const ll INF = 1e18;
      |                ^~~~
cleaning.cpp: In function 'std::unordered_set<int> solve(ll, vv&, vb&, v&, vv&, v&, v&)':
cleaning.cpp:73:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::unordered_set<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |     for (ll i = 0; i < childrenSets.size(); i++)
      |                    ~~^~~~~~~~~~~~~~~~~~~~~
cleaning.cpp:75:36: warning: comparison of integer expressions of different signedness: 'std::unordered_set<int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'int'} [-Wsign-compare]
   75 |         if (childrenSets[i].size() > maxiSize)
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
cleaning.cpp:83:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::unordered_set<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |     for (ll j = 0; j < childrenSets.size(); j++)
      |                    ~~^~~~~~~~~~~~~~~~~~~~~
cleaning.cpp:101:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'int'} and 'std::vector<std::unordered_set<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  101 |     for (ll j = 0; j < childrenSets.size(); j++)
      |                    ~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 75 ms 4828 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 1744 KB Output is correct
2 Correct 12 ms 1852 KB Output is correct
3 Correct 31 ms 18140 KB Output is correct
4 Correct 64 ms 18480 KB Output is correct
5 Correct 71 ms 21828 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 3536 KB Output is correct
2 Correct 14 ms 3536 KB Output is correct
3 Correct 113 ms 46164 KB Output is correct
4 Correct 105 ms 46704 KB Output is correct
5 Correct 56 ms 41808 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 214 ms 8280 KB Output is correct
2 Correct 26 ms 3164 KB Output is correct
3 Correct 9 ms 2536 KB Output is correct
4 Correct 89 ms 5204 KB Output is correct
5 Correct 128 ms 6312 KB Output is correct
6 Correct 228 ms 5876 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 136 ms 16576 KB Output is correct
2 Correct 114 ms 9928 KB Output is correct
3 Correct 85 ms 6304 KB Output is correct
4 Correct 108 ms 9836 KB Output is correct
5 Correct 101 ms 9812 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 395 ms 27368 KB Output is correct
2 Execution timed out 1101 ms 33292 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 75 ms 4828 KB Output is correct
3 Correct 12 ms 1744 KB Output is correct
4 Correct 12 ms 1852 KB Output is correct
5 Correct 31 ms 18140 KB Output is correct
6 Correct 64 ms 18480 KB Output is correct
7 Correct 71 ms 21828 KB Output is correct
8 Correct 14 ms 3536 KB Output is correct
9 Correct 14 ms 3536 KB Output is correct
10 Correct 113 ms 46164 KB Output is correct
11 Correct 105 ms 46704 KB Output is correct
12 Correct 56 ms 41808 KB Output is correct
13 Correct 214 ms 8280 KB Output is correct
14 Correct 26 ms 3164 KB Output is correct
15 Correct 9 ms 2536 KB Output is correct
16 Correct 89 ms 5204 KB Output is correct
17 Correct 128 ms 6312 KB Output is correct
18 Correct 228 ms 5876 KB Output is correct
19 Correct 136 ms 16576 KB Output is correct
20 Correct 114 ms 9928 KB Output is correct
21 Correct 85 ms 6304 KB Output is correct
22 Correct 108 ms 9836 KB Output is correct
23 Correct 101 ms 9812 KB Output is correct
24 Correct 395 ms 27368 KB Output is correct
25 Execution timed out 1101 ms 33292 KB Time limit exceeded
26 Halted 0 ms 0 KB -