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답안 #405142

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
405142 2021-05-15T18:30:31 Z AugustinasJucas 경주 (Race) (IOI11_race) C++14
100 / 100
 873 ms 37844 KB 
#include "race.h"
#include <stdio.h>
#include <stdlib.h>
#include <bits/stdc++.h>
using namespace std;
const int inf = 1e9;
//#include "race.h"
const int dydis = 2e5 + 10;
vector<pair<int, int> > gr[dydis];
int n, k;
bool vis[dydis] = {};
int tevas[dydis];
vector<int> visi;
int sz[dydis];
int ans = inf;
void dfs(int v, int came){
	tevas[v] = came;
	visi.push_back(v);
	sz[v] = 1;
	for(auto x : gr[v]){
		if(x.first == came) continue;
		dfs(x.first, v);
		sz[v] += sz[x.first];
	}
}
int findCentroid(int v){
	visi.clear();
	dfs(v, v);
	
	for(auto x : visi){
		int mx = 0;
		int sm = 0;
		for(int i = 0; i < (int)gr[x].size(); i++){
			if(gr[x][i].first == tevas[x]) continue;
			mx = max(mx, sz[gr[x][i].first]);
			sm += sz[gr[x][i].first];
		}
		mx = max(mx, (int)visi.size()-sm-1);
		if(mx <= (int)visi.size()/2+1) return x;
	}

	exit(0);
	return -1;
}
int curAns[1000010];
int known[1000010];
vector<int> stt;
void dfs1(int v, int came, long long dst, int kek){
	if(dst > k) return;
	stt.push_back(dst);
	curAns[dst] = min(curAns[dst], kek);
	for(auto x : gr[v]){
		if(x.first == came) continue;
		dfs1(x.first, v, dst + x.second, kek+1);
	}
}
void jeiPrik(int v){ // suskaiciuojam, koks ats, jei v priklauso atsakymui

	known[0] = 0;
	vector<int> lik;
	for(auto x : gr[v]){
		stt.clear();
		dfs1(x.first, v, x.second, 1);
		for(auto y : stt){
		//	cout << "bandau " << y << ", tai bus galimai " << curAns[y]  << " + " << known[k-y] << endl;
			ans = min(ans, curAns[y] + known[k-y]);
		}
		for(auto y : stt){
			known[y] = min(known[y], curAns[y]);
		}
		for(auto x : stt) curAns[x] = inf;
		for(auto x : stt) lik.push_back(x);
	}
		
	for(auto x : lik){
		curAns[x] = known[x] = inf;
	}
}
void calc(int v){
	v = findCentroid(v);
	jeiPrik(v);
//	cout << "gaunam, kad centras yra " << v << endl;
	vector<int> kaims;
	for(auto x : gr[v]) kaims.push_back(x.first);
	for(auto x : visi){
		vector<pair<int, int> > naujas;
		for(auto y : gr[x]){
			if(y.first == v) continue;
			naujas.push_back(y);
		}
		gr[x] = naujas;
	}
//	cout << "istrynem " << v << endl;
	for(auto x : kaims) calc(x);
}
int best_path(int N, int K, int H[][2], int L[]){
	for(int i = 0; i <= 1000000; i++) curAns[i] = known[i] = inf;
	n = N; k = K;
	for(int i = 0; i < n-1; i++){
		gr[H[i][0]].push_back({H[i][1], L[i]});
		gr[H[i][1]].push_back({H[i][0], L[i]});
	}
	calc(0);
	return (ans == inf ? -1ll : ans);
}
/*
4 3
0 1 1
1 2 2
1 3 4
2

5 5
0 1 3
1 2 2
2 3 1
3 4 5
1
*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12748 KB Output is correct
2 Correct 8 ms 12748 KB Output is correct
3 Correct 8 ms 12748 KB Output is correct
4 Correct 9 ms 12748 KB Output is correct
5 Correct 8 ms 12748 KB Output is correct
6 Correct 8 ms 12748 KB Output is correct
7 Correct 8 ms 12856 KB Output is correct
8 Correct 9 ms 12748 KB Output is correct
9 Correct 8 ms 12732 KB Output is correct
10 Correct 9 ms 12796 KB Output is correct
11 Correct 8 ms 12748 KB Output is correct
12 Correct 8 ms 12764 KB Output is correct
13 Correct 9 ms 12748 KB Output is correct
14 Correct 8 ms 12784 KB Output is correct
15 Correct 8 ms 12748 KB Output is correct
16 Correct 10 ms 12820 KB Output is correct
17 Correct 10 ms 12856 KB Output is correct
18 Correct 8 ms 12752 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12748 KB Output is correct
2 Correct 8 ms 12748 KB Output is correct
3 Correct 8 ms 12748 KB Output is correct
4 Correct 9 ms 12748 KB Output is correct
5 Correct 8 ms 12748 KB Output is correct
6 Correct 8 ms 12748 KB Output is correct
7 Correct 8 ms 12856 KB Output is correct
8 Correct 9 ms 12748 KB Output is correct
9 Correct 8 ms 12732 KB Output is correct
10 Correct 9 ms 12796 KB Output is correct
11 Correct 8 ms 12748 KB Output is correct
12 Correct 8 ms 12764 KB Output is correct
13 Correct 9 ms 12748 KB Output is correct
14 Correct 8 ms 12784 KB Output is correct
15 Correct 8 ms 12748 KB Output is correct
16 Correct 10 ms 12820 KB Output is correct
17 Correct 10 ms 12856 KB Output is correct
18 Correct 8 ms 12752 KB Output is correct
19 Correct 9 ms 12748 KB Output is correct
20 Correct 8 ms 12848 KB Output is correct
21 Correct 9 ms 12840 KB Output is correct
22 Correct 9 ms 12876 KB Output is correct
23 Correct 10 ms 12876 KB Output is correct
24 Correct 10 ms 12864 KB Output is correct
25 Correct 10 ms 12860 KB Output is correct
26 Correct 10 ms 12876 KB Output is correct
27 Correct 9 ms 12876 KB Output is correct
28 Correct 10 ms 12876 KB Output is correct
29 Correct 12 ms 12876 KB Output is correct
30 Correct 10 ms 12876 KB Output is correct
31 Correct 10 ms 12828 KB Output is correct
32 Correct 10 ms 12832 KB Output is correct
33 Correct 11 ms 12880 KB Output is correct
34 Correct 10 ms 12876 KB Output is correct
35 Correct 10 ms 12832 KB Output is correct
36 Correct 10 ms 12876 KB Output is correct
37 Correct 9 ms 12876 KB Output is correct
38 Correct 10 ms 12876 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12748 KB Output is correct
2 Correct 8 ms 12748 KB Output is correct
3 Correct 8 ms 12748 KB Output is correct
4 Correct 9 ms 12748 KB Output is correct
5 Correct 8 ms 12748 KB Output is correct
6 Correct 8 ms 12748 KB Output is correct
7 Correct 8 ms 12856 KB Output is correct
8 Correct 9 ms 12748 KB Output is correct
9 Correct 8 ms 12732 KB Output is correct
10 Correct 9 ms 12796 KB Output is correct
11 Correct 8 ms 12748 KB Output is correct
12 Correct 8 ms 12764 KB Output is correct
13 Correct 9 ms 12748 KB Output is correct
14 Correct 8 ms 12784 KB Output is correct
15 Correct 8 ms 12748 KB Output is correct
16 Correct 10 ms 12820 KB Output is correct
17 Correct 10 ms 12856 KB Output is correct
18 Correct 8 ms 12752 KB Output is correct
19 Correct 252 ms 19100 KB Output is correct
20 Correct 298 ms 19012 KB Output is correct
21 Correct 249 ms 19384 KB Output is correct
22 Correct 299 ms 19796 KB Output is correct
23 Correct 222 ms 19348 KB Output is correct
24 Correct 119 ms 19124 KB Output is correct
25 Correct 262 ms 21660 KB Output is correct
26 Correct 226 ms 25664 KB Output is correct
27 Correct 295 ms 25428 KB Output is correct
28 Correct 584 ms 36280 KB Output is correct
29 Correct 657 ms 35512 KB Output is correct
30 Correct 296 ms 25284 KB Output is correct
31 Correct 330 ms 25236 KB Output is correct
32 Correct 354 ms 25460 KB Output is correct
33 Correct 567 ms 24232 KB Output is correct
34 Correct 448 ms 24184 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 12748 KB Output is correct
2 Correct 8 ms 12748 KB Output is correct
3 Correct 8 ms 12748 KB Output is correct
4 Correct 9 ms 12748 KB Output is correct
5 Correct 8 ms 12748 KB Output is correct
6 Correct 8 ms 12748 KB Output is correct
7 Correct 8 ms 12856 KB Output is correct
8 Correct 9 ms 12748 KB Output is correct
9 Correct 8 ms 12732 KB Output is correct
10 Correct 9 ms 12796 KB Output is correct
11 Correct 8 ms 12748 KB Output is correct
12 Correct 8 ms 12764 KB Output is correct
13 Correct 9 ms 12748 KB Output is correct
14 Correct 8 ms 12784 KB Output is correct
15 Correct 8 ms 12748 KB Output is correct
16 Correct 10 ms 12820 KB Output is correct
17 Correct 10 ms 12856 KB Output is correct
18 Correct 8 ms 12752 KB Output is correct
19 Correct 9 ms 12748 KB Output is correct
20 Correct 8 ms 12848 KB Output is correct
21 Correct 9 ms 12840 KB Output is correct
22 Correct 9 ms 12876 KB Output is correct
23 Correct 10 ms 12876 KB Output is correct
24 Correct 10 ms 12864 KB Output is correct
25 Correct 10 ms 12860 KB Output is correct
26 Correct 10 ms 12876 KB Output is correct
27 Correct 9 ms 12876 KB Output is correct
28 Correct 10 ms 12876 KB Output is correct
29 Correct 12 ms 12876 KB Output is correct
30 Correct 10 ms 12876 KB Output is correct
31 Correct 10 ms 12828 KB Output is correct
32 Correct 10 ms 12832 KB Output is correct
33 Correct 11 ms 12880 KB Output is correct
34 Correct 10 ms 12876 KB Output is correct
35 Correct 10 ms 12832 KB Output is correct
36 Correct 10 ms 12876 KB Output is correct
37 Correct 9 ms 12876 KB Output is correct
38 Correct 10 ms 12876 KB Output is correct
39 Correct 252 ms 19100 KB Output is correct
40 Correct 298 ms 19012 KB Output is correct
41 Correct 249 ms 19384 KB Output is correct
42 Correct 299 ms 19796 KB Output is correct
43 Correct 222 ms 19348 KB Output is correct
44 Correct 119 ms 19124 KB Output is correct
45 Correct 262 ms 21660 KB Output is correct
46 Correct 226 ms 25664 KB Output is correct
47 Correct 295 ms 25428 KB Output is correct
48 Correct 584 ms 36280 KB Output is correct
49 Correct 657 ms 35512 KB Output is correct
50 Correct 296 ms 25284 KB Output is correct
51 Correct 330 ms 25236 KB Output is correct
52 Correct 354 ms 25460 KB Output is correct
53 Correct 567 ms 24232 KB Output is correct
54 Correct 448 ms 24184 KB Output is correct
55 Correct 23 ms 13528 KB Output is correct
56 Correct 26 ms 13516 KB Output is correct
57 Correct 223 ms 20124 KB Output is correct
58 Correct 57 ms 21508 KB Output is correct
59 Correct 231 ms 25636 KB Output is correct
60 Correct 799 ms 37844 KB Output is correct
61 Correct 310 ms 25408 KB Output is correct
62 Correct 425 ms 26588 KB Output is correct
63 Correct 405 ms 26556 KB Output is correct
64 Correct 873 ms 26908 KB Output is correct
65 Correct 573 ms 25388 KB Output is correct
66 Correct 776 ms 33260 KB Output is correct
67 Correct 155 ms 30132 KB Output is correct
68 Correct 442 ms 26028 KB Output is correct
69 Correct 423 ms 26164 KB Output is correct
70 Correct 422 ms 25520 KB Output is correct