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Submission #879556

# Submission time Handle Problem Language Result Execution time Memory
879556 2023-11-27T16:16:32 Z Shayan86 Spring cleaning (CEOI20_cleaning) C++14
100 / 100
 162 ms 39624 KB 
#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// Ofast, O0, O1, O2, O3, unroll-loops, fast-math, trapv

typedef long long ll;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;

#define Mp          make_pair
#define sep         ' '
#define endl        '\n'
#define F	        first
#define S	        second
#define pb          push_back
#define all(x)      (x).begin(),(x).end()
#define kill(res)	cout << res << '\n', exit(0);
#define set_dec(x)	cout << fixed << setprecision(x);
#define fast_io     ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io     freopen("input.txt", "r", stdin) ; freopen("output.txt", "w", stdout);

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll L = 20;
const ll N = 1e5 + 50;
const ll Mod = 1e9 + 7;

ll n, q, r, sz[N], cnt[N], h[N], sum[N], par[N][L], st[N], timer, upd[N], head[N];

vector<int> adj[N];

void dfs(int v, int p = 0){
    par[v][0] = p;
    for(int i = 1; i < L; i++){
        if(!par[v][i-1]) break;
        par[v][i] = par[par[v][i-1]][i-1];
    }
    
    sz[v] = 1;
    st[v] = ++timer;
    for(int u: adj[v]){
        if(u == p) continue;
        h[u] = h[v] + 1; dfs(u, v);
        sz[v] += sz[u]; cnt[v] += cnt[u];
    }
    if(sz[v] == 1) cnt[v]++;
}

int getPar(int v, int k){
    for(int i = 0; i < L; i++){
        if(k >> i & 1) v = par[v][i];
    }
    return v;
}

int lca(int u, int v){
    if(h[v] < h[u]) swap(u, v);
    v = getPar(v, h[v] - h[u]);
    if(u == v) return v;

    for(int i = L-1; i >= 0; i--){
        if(par[v][i] != par[u][i]){
            v = par[v][i]; u = par[u][i];
        }
    }
    return par[v][0];
}

void pre(int v, int p = 0){
    sum[v] = sum[p] + (cnt[v] % 2);
    for(int u: adj[v]){
        if(u != p) pre(u, v);
    }
}

bool cmp(int i, int j){
    return st[i] < st[j];
}

int main(){
    fast_io;

    cin >> n >> q;

    int u, v;
    for(int i = 1; i < n; i++){
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }

    r = 1;
    while(adj[r].size() == 1) r++;

    dfs(r); pre(r);

    ll ans = 2 * (n-1);
    for(int i = 1; i <= n; i++) if(i != r) ans -= (cnt[i] % 2);
    //cout << ans << endl;

    while(q--){
        int d, x; cin >> d;

        vector<int> vec, vert;
        for(int i = 1; i <= d; i++){
            cin >> x; vec.pb(x); upd[x]++;
        }

        sort(all(vec), cmp);
        vec.resize(unique(all(vec)) - vec.begin());

        for(int i: vec) if(adj[i].size() == 1) upd[i]--;

        set<pii> ms;
        for(int i: vec) ms.insert(Mp(st[i], i));

        while(ms.size() > 1){
            auto lst = ms.end();
            auto lst1 = lst; lst1--;
            auto lst2 = lst1; lst2--;

            int ulv = lca(lst1 -> S, lst2 -> S);
            head[lst1 -> S] = ulv;
            vert.pb(lst1 -> S);

            ms.erase(lst1);
            ms.insert(Mp(st[ulv], ulv));
        }
        vert.pb(ms.begin() -> S); 
        if(vert.back() != r) head[vert.back()] = r;

        for(int i: vert){
            if(head[i]) upd[head[i]] += upd[i];
        }

        ll res = ans;
        for(int i: vert){
            //cout << i << sep << head[i] << sep << upd[i] << endl;
            if(!head[i]) continue;
            if(upd[i] % 2){
                res += sum[i] - sum[head[i]];
                res -= h[i] - h[head[i]] - (sum[i] - sum[head[i]]);
            }
        }

        if((cnt[r] + upd[r]) % 2) cout << -1 << endl;
        else cout << res + d << endl;

        for(int i: vert){
            head[i] = 0; upd[i] = 0;
        }
        upd[r] = 0;
    }

}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8796 KB Output is correct
2 Correct 44 ms 12636 KB Output is correct

Subtask #2
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 9936 KB Output is correct
2 Correct 13 ms 9944 KB Output is correct
3 Correct 27 ms 28372 KB Output is correct
4 Correct 50 ms 26056 KB Output is correct
5 Correct 63 ms 31668 KB Output is correct

Subtask #3
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 10404 KB Output is correct
2 Correct 15 ms 10464 KB Output is correct
3 Correct 45 ms 37436 KB Output is correct
4 Correct 77 ms 39624 KB Output is correct
5 Correct 45 ms 36128 KB Output is correct

Subtask #4
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 13396 KB Output is correct
2 Correct 19 ms 12380 KB Output is correct
3 Correct 7 ms 12040 KB Output is correct
4 Correct 10 ms 12636 KB Output is correct
5 Correct 10 ms 12892 KB Output is correct
6 Correct 36 ms 12892 KB Output is correct

Subtask #5
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 23432 KB Output is correct
2 Correct 92 ms 23492 KB Output is correct
3 Correct 61 ms 15528 KB Output is correct
4 Correct 90 ms 23476 KB Output is correct
5 Correct 86 ms 23408 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 92 ms 29376 KB Output is correct
2 Correct 115 ms 32860 KB Output is correct
3 Correct 108 ms 33064 KB Output is correct
4 Correct 104 ms 32124 KB Output is correct

Subtask #7
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8796 KB Output is correct
2 Correct 44 ms 12636 KB Output is correct
3 Correct 13 ms 9936 KB Output is correct
4 Correct 13 ms 9944 KB Output is correct
5 Correct 27 ms 28372 KB Output is correct
6 Correct 50 ms 26056 KB Output is correct
7 Correct 63 ms 31668 KB Output is correct
8 Correct 15 ms 10404 KB Output is correct
9 Correct 15 ms 10464 KB Output is correct
10 Correct 45 ms 37436 KB Output is correct
11 Correct 77 ms 39624 KB Output is correct
12 Correct 45 ms 36128 KB Output is correct
13 Correct 33 ms 13396 KB Output is correct
14 Correct 19 ms 12380 KB Output is correct
15 Correct 7 ms 12040 KB Output is correct
16 Correct 10 ms 12636 KB Output is correct
17 Correct 10 ms 12892 KB Output is correct
18 Correct 36 ms 12892 KB Output is correct
19 Correct 43 ms 23432 KB Output is correct
20 Correct 92 ms 23492 KB Output is correct
21 Correct 61 ms 15528 KB Output is correct
22 Correct 90 ms 23476 KB Output is correct
23 Correct 86 ms 23408 KB Output is correct
24 Correct 92 ms 29376 KB Output is correct
25 Correct 115 ms 32860 KB Output is correct
26 Correct 108 ms 33064 KB Output is correct
27 Correct 104 ms 32124 KB Output is correct
28 Correct 72 ms 21060 KB Output is correct
29 Correct 125 ms 32548 KB Output is correct
30 Correct 69 ms 31916 KB Output is correct
31 Correct 89 ms 39508 KB Output is correct
32 Correct 82 ms 23276 KB Output is correct
33 Correct 108 ms 29268 KB Output is correct
34 Correct 145 ms 32844 KB Output is correct
35 Correct 162 ms 32800 KB Output is correct