oj.uz

Submission #642840

# Submission time Handle Problem Language Result Execution time Memory
642840 2022-09-20T15:36:43 Z idas Spring cleaning (CEOI20_cleaning) C++17
53 / 100
 1000 ms 29132 KB 
#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define sz(x) ((int)((x).size()))
#define le(vec) vec[vec.size()-1]
#define all(x) (x).begin(), (x).end()
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)

using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e18;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".txt").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

const int N=1e5;

//tot - total amount of leaves in a subtree
//add - number of added leaves to each query for each N node
//bad_ch - number of bad vertices changed during dfs

int n, q, tot[N], bad_ch[N], add_leaves[N], add_edges[N];
unordered_map<int, int> add[N];
vi ad[N];

void pre(int u, int pst)
{
    for(auto x : ad[u]){
        if(x==pst) continue;
        pre(x, u);
        tot[u]+=tot[x];
    }
    if(sz(ad[u])==1) tot[u]++;
}

void dfs(int u, int pst)
{
    for(auto x : ad[u]){
        if(x==pst) continue;
        dfs(x, u);
    }

    int mx=sz(add[u]), mxu=u;
    for(auto x : ad[u]){
        if(x==pst) continue;
        if(sz(add[x])>mx){
            mx=sz(add[x]);
            mxu=x;
        }
    }

    if(mxu!=u) add[u].swap(add[mxu]);

    for(auto x : ad[u]){
        if(x==pst) continue;
        for(auto it : add[x]){
            add[u][it.f]+=it.s;
        }
        add[x].clear();
    }

    for(auto it : add[u]){
        if(it.s&1){
            if(tot[u]&1){
                bad_ch[it.f]++;
            }
            else{
                bad_ch[it.f]--;
            }
        }
    }
}

int main()
{
    setIO();
    cin >> n >> q;
    FOR(i, 0, n-1)
    {
        int a, b; cin >> a >> b; a--; b--;
        ad[a].pb(b);
        ad[b].pb(a);
    }

    pre(0, -1);

    FOR(i, 0, q)
    {
        set<int> st;
        int d; cin >> d;
        FOR(j, 0, d)
        {
            int a; cin >> a; --a;
            if(sz(ad[a])==1){
                if(st.count(a)){
                    add[a][i]++;
                    add_leaves[i]++;
                }
                else{
                    st.insert(a);
                }
            }
            else{
                add[a][i]++;
                add_leaves[i]++;
            }
        }
        add_edges[i]=d;
    }


    int tot_bad=-1, tot_leaf=0; //(we exclude root as it has no parent vertex)
    FOR(i, 0, n)
    {
        if(tot[i]&1^1){
            ++tot_bad;
        }
        if(sz(ad[i])==1){
            ++tot_leaf;
        }
    }

    dfs(0, -1);

    FOR(i, 0, q)
    {
        if((tot_leaf+add_leaves[i])&1){
            cout << "-1\n";
            continue;
        }

        cout << n-1+add_edges[i]+tot_bad+bad_ch[i] << '\n';
    }
}

Compilation message

cleaning.cpp: In function 'int main()':
cleaning.cpp:135:18: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
  135 |         if(tot[i]&1^1){
      |            ~~~~~~^~
cleaning.cpp: In function 'void setIO(std::string)':
cleaning.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s+".txt").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cleaning.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8148 KB Output is correct
2 Correct 52 ms 12592 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 8768 KB Output is correct
2 Correct 21 ms 8848 KB Output is correct
3 Correct 34 ms 12236 KB Output is correct
4 Correct 76 ms 16844 KB Output is correct
5 Correct 86 ms 17936 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 9556 KB Output is correct
2 Correct 15 ms 9468 KB Output is correct
3 Correct 54 ms 22664 KB Output is correct
4 Correct 102 ms 29132 KB Output is correct
5 Correct 47 ms 21236 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 11948 KB Output is correct
2 Correct 21 ms 10324 KB Output is correct
3 Correct 11 ms 8916 KB Output is correct
4 Correct 17 ms 9556 KB Output is correct
5 Correct 23 ms 9960 KB Output is correct
6 Correct 57 ms 12232 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 93 ms 18448 KB Output is correct
2 Correct 92 ms 16476 KB Output is correct
3 Correct 65 ms 14200 KB Output is correct
4 Correct 91 ms 16728 KB Output is correct
5 Correct 90 ms 16516 KB Output is correct

Subtask #6
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 191 ms 22744 KB Output is correct
2 Execution timed out 1099 ms 23608 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8148 KB Output is correct
2 Correct 52 ms 12592 KB Output is correct
3 Correct 23 ms 8768 KB Output is correct
4 Correct 21 ms 8848 KB Output is correct
5 Correct 34 ms 12236 KB Output is correct
6 Correct 76 ms 16844 KB Output is correct
7 Correct 86 ms 17936 KB Output is correct
8 Correct 15 ms 9556 KB Output is correct
9 Correct 15 ms 9468 KB Output is correct
10 Correct 54 ms 22664 KB Output is correct
11 Correct 102 ms 29132 KB Output is correct
12 Correct 47 ms 21236 KB Output is correct
13 Correct 59 ms 11948 KB Output is correct
14 Correct 21 ms 10324 KB Output is correct
15 Correct 11 ms 8916 KB Output is correct
16 Correct 17 ms 9556 KB Output is correct
17 Correct 23 ms 9960 KB Output is correct
18 Correct 57 ms 12232 KB Output is correct
19 Correct 93 ms 18448 KB Output is correct
20 Correct 92 ms 16476 KB Output is correct
21 Correct 65 ms 14200 KB Output is correct
22 Correct 91 ms 16728 KB Output is correct
23 Correct 90 ms 16516 KB Output is correct
24 Correct 191 ms 22744 KB Output is correct
25 Execution timed out 1099 ms 23608 KB Time limit exceeded
26 Halted 0 ms 0 KB -