oj.uz

답안 #678986

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
678986 2023-01-07T06:40:32 Z Makarooni Cat in a tree (BOI17_catinatree) C++17
11 / 100
 1000 ms 28924 KB 
#include <bits/stdc++.h>
using namespace std;

#define mr make_pair
#define endl '\n'
#define F first
#define S second
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz(x) (int) x.size()
//#define int long long

const int N = 2e5 + 10;
const int K = 499;

int dp[N][500], D, ps[N][500];
vector<int> g[N];
unordered_map<int, int> mp[N];
set<int> b[N];

void dfs(int v, int p){
    for(int u : g[v]){
        if(u == p)
            continue;
        dfs(u, v);
    }
    for(int d = D; d > 0; d--){
        vector<int> pr, su, V;
        pr.pb(0);
        su.pb(0);
        int x = D - d - 1;
        if(x < 0)
			continue;
		x = max(x, d - 1);
        for(int u : g[v]){
            if(u == p)
                continue;
            pr.pb(ps[u][x] + pr.back());
            V.pb(u);
        }
        reverse(all(g[v]));
        for(int u : g[v]){
            if(u == p)
                continue;
            su.pb(ps[u][x] + su.back());
        }
        reverse(all(su));
        for(int i = 0; i < sz(pr) - 1; i++){
            dp[v][d] = max(dp[v][d], pr[i] + su[i + 1] + dp[V[i]][d - 1]);
        }
    }
    dp[v][0]++;
    for(int u : g[v]){
        if(u == p)
            continue;
        dp[v][0] += ps[u][D - 1];
    }
    for(int i = D; i >= 0; i--)
    	ps[v][i] = max(ps[v][i + 1], dp[v][i]);
}

void dfs2(int v, int par){
    for(int u : g[v]){
        if(u == par)
            continue;
        dfs2(u, v);
    }
    for(int p = 499; p >= 1; p--){
    	//cout << p << endl;
    	int l = 0, r = 200001;
    	while(r - l > 1){
    		//cout << l << " " << r << endl;
		int d = (l + r) / 2;
        vector<int> pr, su, V;
        pr.pb(0);
        su.pb(0);
        int x = D - d - 1;
        if(x < 0){
        	r = d;
			continue;
		}
		x = max(x, d - 1);
        for(int u : g[v]){
            if(u == par)
                continue;
            auto it = b[u].lower_bound(x);
        	if(it == b[u].end())
        		pr.pb(pr.back());
            pr.pb(mp[u][*it] + pr.back());
            V.pb(u);
        }
        reverse(all(g[v]));
        for(int u : g[v]){
            if(u == par)
                continue;
            auto it = b[u].lower_bound(x);
        	if(it == b[u].end())
        		su.pb(su.back());
            su.pb(mp[u][*it] + su.back());
        }
        reverse(all(su));
        int ssb = 0;
        for(int i = 0; i < sz(pr) - 1; i++){
        	auto it = b[V[i]].lower_bound(d - 1);
        	if(it == b[V[i]].end())
        		continue;
			//cout << "hoora " << V[i] << " " << pr[i] << " " << su[i + 1] << " " << mp[V[i]][*it] << endl;
            ssb = max(ssb, pr[i] + su[i + 1] + mp[V[i]][*it]);
        }
        if(ssb >= p){
        	dp[v][p] = max(dp[v][p], d);
        	l = d;
		}
		else
			r = d;
		}
    }
    int ssb = 0;
    ssb++;
    for(int u : g[v]){
        if(u == par)
            continue;
        ssb += mp[u][D - 1];
    }
    dp[v][ssb] = max(dp[v][ssb], 0);
    for(int i = 499; i >= 0; i--){
    	mp[v][dp[v][i]] = max(mp[v][dp[v][i]], i);
    	b[v].insert(dp[v][i]);
    }
}

int32_t main(){
    ios_base:: sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int n;
    cin >> n >> D;
    if(D > n){
    	cout << 1;
    	return 0;
	}
	if(D == 1){
		cout << n;
		return 0;
	}
    int p;
    for(int i = 1; i < n; i++){
        cin >> p;
        g[i].pb(p);
        g[p].pb(i);
    }
    if(D < 500){
    	dfs(0, -1);
    	cout << ps[0][0];
    }
    else{
		for(int i = 0; i < n; i++){
    		for(int j = 0; j <= K; j++)
    			dp[i][j] = -1000000000;
		}
    	dfs2(0, -1);
		//cout << "# " << dp[1][1] << endl;
		int ans = 1;
		for(int i = 1; i <= K; i++){
			if(dp[0][i] >= 0)
				ans = max(ans, i);
		}
		cout << ans;
	}
}

Subtask #1
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 25428 KB Output is correct
2 Correct 14 ms 25392 KB Output is correct
3 Correct 14 ms 25388 KB Output is correct
4 Correct 15 ms 25352 KB Output is correct
5 Correct 16 ms 25440 KB Output is correct
6 Correct 13 ms 25428 KB Output is correct
7 Correct 14 ms 25456 KB Output is correct
8 Correct 14 ms 25428 KB Output is correct
9 Correct 13 ms 25300 KB Output is correct
10 Correct 14 ms 25428 KB Output is correct
11 Correct 13 ms 25300 KB Output is correct
12 Correct 16 ms 25340 KB Output is correct
13 Correct 14 ms 25384 KB Output is correct
14 Correct 13 ms 25404 KB Output is correct
15 Correct 14 ms 25372 KB Output is correct
16 Correct 15 ms 25388 KB Output is correct
17 Correct 13 ms 25428 KB Output is correct
18 Correct 14 ms 25428 KB Output is correct
19 Correct 15 ms 25428 KB Output is correct
20 Correct 13 ms 25428 KB Output is correct

Subtask #2
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 25428 KB Output is correct
2 Correct 14 ms 25392 KB Output is correct
3 Correct 14 ms 25388 KB Output is correct
4 Correct 15 ms 25352 KB Output is correct
5 Correct 16 ms 25440 KB Output is correct
6 Correct 13 ms 25428 KB Output is correct
7 Correct 14 ms 25456 KB Output is correct
8 Correct 14 ms 25428 KB Output is correct
9 Correct 13 ms 25300 KB Output is correct
10 Correct 14 ms 25428 KB Output is correct
11 Correct 13 ms 25300 KB Output is correct
12 Correct 16 ms 25340 KB Output is correct
13 Correct 14 ms 25384 KB Output is correct
14 Correct 13 ms 25404 KB Output is correct
15 Correct 14 ms 25372 KB Output is correct
16 Correct 15 ms 25388 KB Output is correct
17 Correct 13 ms 25428 KB Output is correct
18 Correct 14 ms 25428 KB Output is correct
19 Correct 15 ms 25428 KB Output is correct
20 Correct 13 ms 25428 KB Output is correct
21 Execution timed out 1096 ms 28924 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #3
0 / 49.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 25428 KB Output is correct
2 Correct 14 ms 25392 KB Output is correct
3 Correct 14 ms 25388 KB Output is correct
4 Correct 15 ms 25352 KB Output is correct
5 Correct 16 ms 25440 KB Output is correct
6 Correct 13 ms 25428 KB Output is correct
7 Correct 14 ms 25456 KB Output is correct
8 Correct 14 ms 25428 KB Output is correct
9 Correct 13 ms 25300 KB Output is correct
10 Correct 14 ms 25428 KB Output is correct
11 Correct 13 ms 25300 KB Output is correct
12 Correct 16 ms 25340 KB Output is correct
13 Correct 14 ms 25384 KB Output is correct
14 Correct 13 ms 25404 KB Output is correct
15 Correct 14 ms 25372 KB Output is correct
16 Correct 15 ms 25388 KB Output is correct
17 Correct 13 ms 25428 KB Output is correct
18 Correct 14 ms 25428 KB Output is correct
19 Correct 15 ms 25428 KB Output is correct
20 Correct 13 ms 25428 KB Output is correct
21 Execution timed out 1096 ms 28924 KB Time limit exceeded
22 Halted 0 ms 0 KB -