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답안 #377828

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
377828 2021-03-15T08:16:12 Z kshitij_sodani Janjetina (COCI21_janjetina) C++14
110 / 110
 584 ms 37480 KB 
//#pragma GCC optimize("Ofast,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
typedef long long llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second
#define endl '\n'

llo n,k;
vector<pair<llo,llo>> adj[100001];
llo vis[100001];
llo cot[100001];
llo ss[100001];
void dfs(llo no,llo parr=-1){
	ss[no]=1;
	for(auto j:adj[no]){
		if(vis[j.a]==0){
			if(j.a!=parr){
				dfs(j.a,no);
				ss[no]+=ss[j.a];
			}
		}
	}
}
llo pp;
llo find(llo no,llo parr=-1){
	for(auto j:adj[no]){
		if(vis[j.a]==0){
			if(j.a!=parr){
				if(ss[j.a]>ss[pp]/2){
				//	cout<<no<<",,"<<j.a<<endl;
					return find(j.a,no);
				}
			}
		}
	}
	return no;
}
llo lev[100001];
llo par[100001];
vector<llo> tree[100001];
void u(llo ind,llo i,llo j){
	while(i<tree[ind].size()){
		tree[ind][i]+=j;
		i+=(i&-i);
	}
}
llo ss2(llo ind,llo i){
	llo su=0;
	i=min(i,(llo)(tree[ind].size())-1);
	while(i>0){
		su+=tree[ind][i];
		i-=(i&-i);
	}
	return su;
}
vector<llo> zz;
void dfs2(llo no,llo parr=-1,llo levv=0,llo xx=-1){
	if(levv==1){
		xx=no;
		zz.pb(no);
	}
	par[no]=xx;
	lev[no]=levv;
	ss[no]=1;
	for(auto j:adj[no]){
		if(vis[j.a]==0){
			if(j.a!=parr){
				dfs2(j.a,no,levv+1,xx);
				ss[no]+=ss[j.a];
			}
		}
	}
	
}
llo ans=0;
void dec(llo no){
	pp=no;
	dfs(no);
	/*for(int i=0;i<n;i++){
		cout<<ss[i]<<",";
	}
	cout<<endl;*/
	llo cen=find(no);

	dfs2(cen);
	tree[0].clear();
	for(llo i=0;i<=ss[cen];i++){
		tree[0].pb(0);
	}
	for(auto j:zz){
		tree[j+1].clear();
		for(llo m=0;m<=ss[j];m++){
			tree[j+1].pb(0);
		}
	}
	//cout<<cen<<":"<<endl;
	//return ;
	priority_queue<pair<llo,llo>> xx;
	xx.push({0,cen});
	while(xx.size()){
		pair<llo,llo> no=xx.top();
		xx.pop();
		no.a=-no.a;
		//cout<<no.a<<","<<no.b<<endl;
		for(auto j:adj[no.b]){
			if(vis[j.a]==0 and lev[j.a]>lev[no.b]){
				xx.push({-max(no.a,j.b),j.a});
			}
		}
		llo cur=no.a-k-lev[no.b];
		if(cur>=0){
			ans+=ss2(0,cur+1);
			if(no.b!=cen){
				ans-=(ss2(par[no.b]+1,cur+1));
			}
		}

		u(0,lev[no.b]+1,1);
		if(no.b!=cen){
			u(par[no.b]+1,lev[no.b]+1,1);
		}
	}
//	cout<<cen<<":"<<ans<<endl;

	zz.clear();
	vis[cen]=1;
	for(auto j:adj[cen]){
		if(vis[j.a]==0){
			dec(j.a);
		}
	}
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>k;
 	for(llo i=0;i<n-1;i++){
 		llo aa,bb,cc;
 		cin>>aa>>bb>>cc;
 		aa--;
 		bb--;
 		adj[aa].pb({bb,cc});
 		adj[bb].pb({aa,cc});
 	}
 	dec(0);
 	ans*=2;
 	cout<<ans<<endl;
	
 
	return 0;
}

Compilation message

Main.cpp: In function 'void u(llo, llo, llo)':
Main.cpp:45:9: warning: comparison of integer expressions of different signedness: 'llo' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |  while(i<tree[ind].size()){
      |        ~^~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 5 ms 5228 KB Output is correct
5 Correct 5 ms 5228 KB Output is correct
6 Correct 5 ms 5228 KB Output is correct
7 Correct 5 ms 5228 KB Output is correct
8 Correct 5 ms 5228 KB Output is correct
9 Correct 5 ms 5228 KB Output is correct
10 Correct 5 ms 5228 KB Output is correct
11 Correct 5 ms 5228 KB Output is correct
12 Correct 5 ms 5228 KB Output is correct
13 Correct 5 ms 5228 KB Output is correct
14 Correct 6 ms 5228 KB Output is correct
15 Correct 5 ms 5228 KB Output is correct
16 Correct 5 ms 5228 KB Output is correct
17 Correct 5 ms 5228 KB Output is correct
18 Correct 6 ms 5228 KB Output is correct
19 Correct 5 ms 5228 KB Output is correct
20 Correct 5 ms 5228 KB Output is correct
21 Correct 5 ms 5228 KB Output is correct
22 Correct 5 ms 5228 KB Output is correct

Subtask #2
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 5 ms 5228 KB Output is correct
5 Correct 21 ms 8172 KB Output is correct
6 Correct 103 ms 20836 KB Output is correct
7 Correct 192 ms 37088 KB Output is correct
8 Correct 215 ms 37344 KB Output is correct
9 Correct 194 ms 36960 KB Output is correct
10 Correct 216 ms 37344 KB Output is correct
11 Correct 190 ms 36988 KB Output is correct
12 Correct 214 ms 37344 KB Output is correct
13 Correct 202 ms 37088 KB Output is correct
14 Correct 213 ms 37216 KB Output is correct
15 Correct 215 ms 37088 KB Output is correct
16 Correct 216 ms 37216 KB Output is correct
17 Correct 218 ms 37216 KB Output is correct
18 Correct 211 ms 37216 KB Output is correct

Subtask #3
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5100 KB Output is correct
4 Correct 5 ms 5228 KB Output is correct
5 Correct 5 ms 5228 KB Output is correct
6 Correct 5 ms 5228 KB Output is correct
7 Correct 5 ms 5228 KB Output is correct
8 Correct 5 ms 5228 KB Output is correct
9 Correct 5 ms 5228 KB Output is correct
10 Correct 5 ms 5228 KB Output is correct
11 Correct 5 ms 5228 KB Output is correct
12 Correct 5 ms 5228 KB Output is correct
13 Correct 5 ms 5228 KB Output is correct
14 Correct 6 ms 5228 KB Output is correct
15 Correct 5 ms 5228 KB Output is correct
16 Correct 5 ms 5228 KB Output is correct
17 Correct 5 ms 5228 KB Output is correct
18 Correct 6 ms 5228 KB Output is correct
19 Correct 5 ms 5228 KB Output is correct
20 Correct 5 ms 5228 KB Output is correct
21 Correct 5 ms 5228 KB Output is correct
22 Correct 5 ms 5228 KB Output is correct
23 Correct 4 ms 5100 KB Output is correct
24 Correct 4 ms 5100 KB Output is correct
25 Correct 4 ms 5100 KB Output is correct
26 Correct 5 ms 5228 KB Output is correct
27 Correct 21 ms 8172 KB Output is correct
28 Correct 103 ms 20836 KB Output is correct
29 Correct 192 ms 37088 KB Output is correct
30 Correct 215 ms 37344 KB Output is correct
31 Correct 194 ms 36960 KB Output is correct
32 Correct 216 ms 37344 KB Output is correct
33 Correct 190 ms 36988 KB Output is correct
34 Correct 214 ms 37344 KB Output is correct
35 Correct 202 ms 37088 KB Output is correct
36 Correct 213 ms 37216 KB Output is correct
37 Correct 215 ms 37088 KB Output is correct
38 Correct 216 ms 37216 KB Output is correct
39 Correct 218 ms 37216 KB Output is correct
40 Correct 211 ms 37216 KB Output is correct
41 Correct 4 ms 5100 KB Output is correct
42 Correct 190 ms 36832 KB Output is correct
43 Correct 211 ms 37344 KB Output is correct
44 Correct 188 ms 36960 KB Output is correct
45 Correct 215 ms 37216 KB Output is correct
46 Correct 188 ms 36832 KB Output is correct
47 Correct 227 ms 37480 KB Output is correct
48 Correct 193 ms 36960 KB Output is correct
49 Correct 248 ms 37216 KB Output is correct
50 Correct 217 ms 37216 KB Output is correct
51 Correct 216 ms 37216 KB Output is correct
52 Correct 260 ms 22112 KB Output is correct
53 Correct 232 ms 22588 KB Output is correct
54 Correct 187 ms 21856 KB Output is correct
55 Correct 229 ms 22496 KB Output is correct
56 Correct 234 ms 22368 KB Output is correct
57 Correct 419 ms 26468 KB Output is correct
58 Correct 432 ms 26088 KB Output is correct
59 Correct 389 ms 26720 KB Output is correct
60 Correct 457 ms 26968 KB Output is correct
61 Correct 469 ms 26480 KB Output is correct
62 Correct 440 ms 24568 KB Output is correct
63 Correct 431 ms 25068 KB Output is correct
64 Correct 584 ms 25444 KB Output is correct
65 Correct 21 ms 5996 KB Output is correct
66 Correct 3 ms 5100 KB Output is correct