oj.uz

답안 #447063

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
447063 2021-07-24T11:28:20 Z Jasiekstrz Janjetina (COCI21_janjetina) C++17
110 / 110
 1214 ms 113732 KB 
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
const int N=1e5;
typedef tree<pair<int,int>,null_type,less<pair<int,int>>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
vector<pair<int,int>> e[N+10];
bool vis[N+10];
int siz[N+10];
int dep[N+10];
int par[N+10];
int mx[N+10];
ordered_set os;
ordered_set st[N+10];
priority_queue<pair<int,int>> pq;
void dfs_size(int x,int p)
{
	siz[x]=1;
	for(auto v:e[x])
	{
		if(v.fi!=p && !vis[v.fi])
		{
			dfs_size(v.fi,x);
			siz[x]+=siz[v.fi];
		}
	}
	return;
}
int find_centro(int x,int p,int size_all)
{
	for(auto v:e[x])
	{
		if(v.fi!=p && !vis[v.fi])
		{
			int tmp=find_centro(v.fi,x,size_all);
			if(tmp!=-1)
				return tmp;
		}
	}
	if(2*siz[x]>=size_all)
		return x;
	return -1;
}
long long centro(int x,int k)
{
	dfs_size(x,0);
	x=find_centro(x,0,siz[x]);
	dfs_size(x,0);
	//cerr<<"centro "<<x<<"\n";
	vis[x]=true;
	dep[x]=0;
	mx[x]=0;
	os.clear();
	while(!pq.empty())
		pq.pop();
	os.insert({0,x});
	for(auto [v,c]:e[x])
	{
		if(!vis[v])
		{
			dep[v]=1;
			mx[v]=c;
			par[v]=v;
			st[v].clear();
			pq.emplace(-mx[v],v);
		}
	}
	long long ans=0;
	while(!pq.empty())
	{
		int y=pq.top().se;
		pq.pop();
		int d=mx[y]-dep[y]-k;
		//cerr<<y<<" "<<d<<"\n";
		ans+=os.order_of_key({d+1,0})-st[par[y]].order_of_key({d+1,0});
		os.insert({dep[y],y});
		st[par[y]].insert({dep[y],y});
		for(auto [v,c]:e[y])
		{
			if(!vis[v] && siz[v]<siz[y])
			{
				mx[v]=max(mx[y],c);
				dep[v]=dep[y]+1;
				par[v]=par[y];
				pq.emplace(-mx[v],v);
			}
		}
	}
	for(auto [v,c]:e[x])
	{
		if(!vis[v])
			ans+=centro(v,k);
	}
	return ans;
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n,k;
	cin>>n>>k;
	for(int i=1;i<n;i++)
	{
		int a,b,c;
		cin>>a>>b>>c;
		e[a].emplace_back(b,c);
		e[b].emplace_back(a,c);
	}
	cout<<2*centro(1,k)<<"\n";
	return 0;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 11980 KB Output is correct
2 Correct 10 ms 12088 KB Output is correct
3 Correct 10 ms 12108 KB Output is correct
4 Correct 14 ms 12468 KB Output is correct
5 Correct 13 ms 12464 KB Output is correct
6 Correct 13 ms 12468 KB Output is correct
7 Correct 15 ms 12344 KB Output is correct
8 Correct 14 ms 12376 KB Output is correct
9 Correct 16 ms 12236 KB Output is correct
10 Correct 12 ms 12332 KB Output is correct
11 Correct 12 ms 12328 KB Output is correct
12 Correct 13 ms 12328 KB Output is correct
13 Correct 13 ms 12296 KB Output is correct
14 Correct 14 ms 12296 KB Output is correct
15 Correct 13 ms 12236 KB Output is correct
16 Correct 13 ms 12236 KB Output is correct
17 Correct 13 ms 12228 KB Output is correct
18 Correct 13 ms 12204 KB Output is correct
19 Correct 13 ms 12236 KB Output is correct
20 Correct 13 ms 12204 KB Output is correct
21 Correct 13 ms 12236 KB Output is correct
22 Correct 13 ms 12312 KB Output is correct

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 11980 KB Output is correct
2 Correct 10 ms 12080 KB Output is correct
3 Correct 10 ms 12100 KB Output is correct
4 Correct 14 ms 12464 KB Output is correct
5 Correct 64 ms 14720 KB Output is correct
6 Correct 461 ms 59556 KB Output is correct
7 Correct 981 ms 113136 KB Output is correct
8 Correct 1093 ms 113580 KB Output is correct
9 Correct 973 ms 113172 KB Output is correct
10 Correct 1106 ms 113604 KB Output is correct
11 Correct 969 ms 113228 KB Output is correct
12 Correct 1079 ms 113732 KB Output is correct
13 Correct 963 ms 113476 KB Output is correct
14 Correct 1120 ms 113552 KB Output is correct
15 Correct 1118 ms 113464 KB Output is correct
16 Correct 1094 ms 113504 KB Output is correct
17 Correct 1072 ms 113620 KB Output is correct
18 Correct 1060 ms 113348 KB Output is correct

Subtask #3
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 11980 KB Output is correct
2 Correct 10 ms 12088 KB Output is correct
3 Correct 10 ms 12108 KB Output is correct
4 Correct 14 ms 12468 KB Output is correct
5 Correct 13 ms 12464 KB Output is correct
6 Correct 13 ms 12468 KB Output is correct
7 Correct 15 ms 12344 KB Output is correct
8 Correct 14 ms 12376 KB Output is correct
9 Correct 16 ms 12236 KB Output is correct
10 Correct 12 ms 12332 KB Output is correct
11 Correct 12 ms 12328 KB Output is correct
12 Correct 13 ms 12328 KB Output is correct
13 Correct 13 ms 12296 KB Output is correct
14 Correct 14 ms 12296 KB Output is correct
15 Correct 13 ms 12236 KB Output is correct
16 Correct 13 ms 12236 KB Output is correct
17 Correct 13 ms 12228 KB Output is correct
18 Correct 13 ms 12204 KB Output is correct
19 Correct 13 ms 12236 KB Output is correct
20 Correct 13 ms 12204 KB Output is correct
21 Correct 13 ms 12236 KB Output is correct
22 Correct 13 ms 12312 KB Output is correct
23 Correct 12 ms 11980 KB Output is correct
24 Correct 10 ms 12080 KB Output is correct
25 Correct 10 ms 12100 KB Output is correct
26 Correct 14 ms 12464 KB Output is correct
27 Correct 64 ms 14720 KB Output is correct
28 Correct 461 ms 59556 KB Output is correct
29 Correct 981 ms 113136 KB Output is correct
30 Correct 1093 ms 113580 KB Output is correct
31 Correct 973 ms 113172 KB Output is correct
32 Correct 1106 ms 113604 KB Output is correct
33 Correct 969 ms 113228 KB Output is correct
34 Correct 1079 ms 113732 KB Output is correct
35 Correct 963 ms 113476 KB Output is correct
36 Correct 1120 ms 113552 KB Output is correct
37 Correct 1118 ms 113464 KB Output is correct
38 Correct 1094 ms 113504 KB Output is correct
39 Correct 1072 ms 113620 KB Output is correct
40 Correct 1060 ms 113348 KB Output is correct
41 Correct 10 ms 12068 KB Output is correct
42 Correct 945 ms 113152 KB Output is correct
43 Correct 1100 ms 113672 KB Output is correct
44 Correct 974 ms 113220 KB Output is correct
45 Correct 1127 ms 113716 KB Output is correct
46 Correct 956 ms 113192 KB Output is correct
47 Correct 1104 ms 113584 KB Output is correct
48 Correct 970 ms 113260 KB Output is correct
49 Correct 1116 ms 113540 KB Output is correct
50 Correct 1114 ms 113416 KB Output is correct
51 Correct 1071 ms 113492 KB Output is correct
52 Correct 567 ms 43556 KB Output is correct
53 Correct 527 ms 43972 KB Output is correct
54 Correct 518 ms 43332 KB Output is correct
55 Correct 536 ms 43844 KB Output is correct
56 Correct 634 ms 43844 KB Output is correct
57 Correct 1178 ms 38240 KB Output is correct
58 Correct 1024 ms 40776 KB Output is correct
59 Correct 1102 ms 38840 KB Output is correct
60 Correct 1136 ms 38340 KB Output is correct
61 Correct 1214 ms 40036 KB Output is correct
62 Correct 906 ms 39744 KB Output is correct
63 Correct 995 ms 43052 KB Output is correct
64 Correct 1036 ms 44508 KB Output is correct
65 Correct 32 ms 13136 KB Output is correct
66 Correct 10 ms 12072 KB Output is correct