oj.uz

답안 #769915

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
769915 2023-06-30T13:14:47 Z ByeWorld 경주 (Race) (IOI11_race) C++14
100 / 100
 352 ms 98828 KB 
#include <bits/stdc++.h>
#include "race.h"
#define fi first
#define se second
#define pb push_back
#define ll long long
using namespace std;
typedef pair<ll,ll> pii;
typedef pair<ll, pii> ipii;
const ll MAXN = 2e5+10;
const ll INF = 2e18;
const ll MOD = 1e9+7;

ll n, k;
vector <pii> adj[MAXN];
ll sub[MAXN], big[MAXN], dep[MAXN], off[MAXN];
ll ans = INF;
map <ll, ll> *m[MAXN];

void dfs(ll nw, ll par){
	sub[nw] = 1; dep[nw] = dep[par]+1;
	big[nw] = n+1;
	for(auto ed : adj[nw]){
		ll nx = ed.fi;
		if(nx == par) continue;
		dfs(nx, nw);
		if(sub[nx] > sub[big[nw]]) big[nw] = nx;
		sub[nw] += sub[nx];
	}
}
void upd(ll nw, ll len, ll depth){
	if((*m[nw]).find(len) == (*m[nw]).end()) (*m[nw])[len] = depth;
	else (*m[nw])[len] = min((*m[nw])[len], depth);
}
void dsu(ll nw, ll par){
	if(adj[nw].size() == 1 && par != 0){ //leaf
		m[nw] = new map<ll,ll>;
		upd(nw, 0, dep[nw]);
		return;
	}
	for(auto ed : adj[nw]){
		ll nx = ed.fi; ll wei = ed.se;
		if(nx == par) continue;
		dsu(nx, nw); //dfs
		off[nx] += wei; //nambah edge
	}
	m[nw] = m[big[nw]]; off[nw] = off[big[nw]]; //offset + map sama
	upd(nw, -off[nw], dep[nw]);

	for(auto ed : adj[nw]){
		ll nx = ed.fi; ll wei = ed.se;
		if(nx == par || nx == big[nw]) continue;

		// cek inside
		for(auto in : (*m[nx])){
			ll len = in.fi; ll depth = in.se;
			len += off[nx]; //keluar, nambahin

			if(len > k || (*m[nw]).find(k-len-off[nw]) == (*m[nw]).end() ) continue; //gk ad
			ans = min(ans, (*m[nw])[k-len-off[nw]] + depth - 2*dep[nw]);
			//cek dalem, kurangin
		}
		// merge (*m[nx])
		for(auto in : (*m[nx])){
			ll len = in.fi; ll depth = in.se;
			len += off[nx];
			if( (*m[nw]).find(len-off[nw]) == (*m[nw]).end() ) (*m[nw])[len-off[nw]] = depth;
			else (*m[nw])[len-off[nw]] = min((*m[nw])[len-off[nw]], depth);
		}
	}
	// cout << nw << ' ' << off[nw] << "off\n";
	// for(auto in : (*m[nw])){
	// 	cout << in.fi << ' '<< in.se << '\n';
	// }
	//cek dalem
	if( (*m[nw]).find(k-off[nw]) != (*m[nw]).end() )
		ans = min(ans, (*m[nw])[k-off[nw]] - dep[nw]);
}

int best_path(int N, int K, int H[][2], int L[]){
	n = N; k = K;
	for(ll i=0; i<n-1; i++){
		adj[H[i][0]+1].pb({H[i][1]+1, L[i]});
		adj[H[i][1]+1].pb({H[i][0]+1, L[i]});
	}
	// 1-n
	dfs(1, 0);
	dsu(1, 0);
	return (ans==INF ? -1 : ans);
}

Compilation message

race.cpp: In function 'void dsu(long long int, long long int)':
race.cpp:51:21: warning: unused variable 'wei' [-Wunused-variable]
   51 |   ll nx = ed.fi; ll wei = ed.se;
      |                     ^~~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5004 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 3 ms 5000 KB Output is correct
6 Correct 2 ms 5004 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5000 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Correct 2 ms 5076 KB Output is correct
14 Correct 2 ms 5076 KB Output is correct
15 Correct 2 ms 5008 KB Output is correct
16 Correct 2 ms 5000 KB Output is correct
17 Correct 2 ms 5000 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5004 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 3 ms 5000 KB Output is correct
6 Correct 2 ms 5004 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5000 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Correct 2 ms 5076 KB Output is correct
14 Correct 2 ms 5076 KB Output is correct
15 Correct 2 ms 5008 KB Output is correct
16 Correct 2 ms 5000 KB Output is correct
17 Correct 2 ms 5000 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 2 ms 4948 KB Output is correct
20 Correct 3 ms 5008 KB Output is correct
21 Correct 3 ms 5268 KB Output is correct
22 Correct 3 ms 5400 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5272 KB Output is correct
25 Correct 3 ms 5332 KB Output is correct
26 Correct 3 ms 5400 KB Output is correct
27 Correct 3 ms 5140 KB Output is correct
28 Correct 3 ms 5272 KB Output is correct
29 Correct 3 ms 5356 KB Output is correct
30 Correct 3 ms 5332 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 3 ms 5272 KB Output is correct
33 Correct 4 ms 5396 KB Output is correct
34 Correct 3 ms 5268 KB Output is correct
35 Correct 3 ms 5204 KB Output is correct
36 Correct 3 ms 5204 KB Output is correct
37 Correct 3 ms 5204 KB Output is correct
38 Correct 3 ms 5204 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5004 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 3 ms 5000 KB Output is correct
6 Correct 2 ms 5004 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5000 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Correct 2 ms 5076 KB Output is correct
14 Correct 2 ms 5076 KB Output is correct
15 Correct 2 ms 5008 KB Output is correct
16 Correct 2 ms 5000 KB Output is correct
17 Correct 2 ms 5000 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 81 ms 30260 KB Output is correct
20 Correct 92 ms 30232 KB Output is correct
21 Correct 79 ms 30316 KB Output is correct
22 Correct 80 ms 30924 KB Output is correct
23 Correct 107 ms 44584 KB Output is correct
24 Correct 97 ms 39036 KB Output is correct
25 Correct 69 ms 25868 KB Output is correct
26 Correct 43 ms 33288 KB Output is correct
27 Correct 140 ms 47760 KB Output is correct
28 Correct 194 ms 74400 KB Output is correct
29 Correct 198 ms 72884 KB Output is correct
30 Correct 141 ms 47828 KB Output is correct
31 Correct 141 ms 47784 KB Output is correct
32 Correct 175 ms 47956 KB Output is correct
33 Correct 158 ms 40520 KB Output is correct
34 Correct 235 ms 73188 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5076 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 5004 KB Output is correct
4 Correct 2 ms 5076 KB Output is correct
5 Correct 3 ms 5000 KB Output is correct
6 Correct 2 ms 5004 KB Output is correct
7 Correct 3 ms 5076 KB Output is correct
8 Correct 3 ms 5076 KB Output is correct
9 Correct 2 ms 5076 KB Output is correct
10 Correct 2 ms 5076 KB Output is correct
11 Correct 2 ms 5000 KB Output is correct
12 Correct 2 ms 5076 KB Output is correct
13 Correct 2 ms 5076 KB Output is correct
14 Correct 2 ms 5076 KB Output is correct
15 Correct 2 ms 5008 KB Output is correct
16 Correct 2 ms 5000 KB Output is correct
17 Correct 2 ms 5000 KB Output is correct
18 Correct 3 ms 5076 KB Output is correct
19 Correct 2 ms 4948 KB Output is correct
20 Correct 3 ms 5008 KB Output is correct
21 Correct 3 ms 5268 KB Output is correct
22 Correct 3 ms 5400 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5272 KB Output is correct
25 Correct 3 ms 5332 KB Output is correct
26 Correct 3 ms 5400 KB Output is correct
27 Correct 3 ms 5140 KB Output is correct
28 Correct 3 ms 5272 KB Output is correct
29 Correct 3 ms 5356 KB Output is correct
30 Correct 3 ms 5332 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 3 ms 5272 KB Output is correct
33 Correct 4 ms 5396 KB Output is correct
34 Correct 3 ms 5268 KB Output is correct
35 Correct 3 ms 5204 KB Output is correct
36 Correct 3 ms 5204 KB Output is correct
37 Correct 3 ms 5204 KB Output is correct
38 Correct 3 ms 5204 KB Output is correct
39 Correct 81 ms 30260 KB Output is correct
40 Correct 92 ms 30232 KB Output is correct
41 Correct 79 ms 30316 KB Output is correct
42 Correct 80 ms 30924 KB Output is correct
43 Correct 107 ms 44584 KB Output is correct
44 Correct 97 ms 39036 KB Output is correct
45 Correct 69 ms 25868 KB Output is correct
46 Correct 43 ms 33288 KB Output is correct
47 Correct 140 ms 47760 KB Output is correct
48 Correct 194 ms 74400 KB Output is correct
49 Correct 198 ms 72884 KB Output is correct
50 Correct 141 ms 47828 KB Output is correct
51 Correct 141 ms 47784 KB Output is correct
52 Correct 175 ms 47956 KB Output is correct
53 Correct 158 ms 40520 KB Output is correct
54 Correct 235 ms 73188 KB Output is correct
55 Correct 13 ms 8576 KB Output is correct
56 Correct 8 ms 7192 KB Output is correct
57 Correct 49 ms 29712 KB Output is correct
58 Correct 44 ms 28544 KB Output is correct
59 Correct 70 ms 39624 KB Output is correct
60 Correct 206 ms 73236 KB Output is correct
61 Correct 167 ms 51288 KB Output is correct
62 Correct 146 ms 48036 KB Output is correct
63 Correct 169 ms 47932 KB Output is correct
64 Correct 352 ms 97100 KB Output is correct
65 Correct 333 ms 98828 KB Output is correct
66 Correct 202 ms 69380 KB Output is correct
67 Correct 119 ms 52784 KB Output is correct
68 Correct 247 ms 67900 KB Output is correct
69 Correct 233 ms 68444 KB Output is correct
70 Correct 212 ms 65124 KB Output is correct