oj.uz

답안 #306495

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
306495 2020-09-25T17:36:11 Z tengiz05 꿈 (IOI13_dreaming) C++17
0 / 100
 99 ms 17176 KB 
#include "dreaming.h"
#include <bits/stdc++.h>
using namespace std;
int n;
const int N = 1e5+5;
bool used[N];
int depth[N];
int dp[N];
vector<pair<int, int>> edges[N];
vector<int> a[N];
// dfs for calculating dp. (dp[i] - maximum depth)
void dfs(int u, int p){
	used[u] = true;
	dp[u] = 0;
	a[u].push_back(0);a[u].push_back(0);
	for(auto X : edges[u]){
		int v = X.first;
		int cost = X.second;
		if(v == p)continue;
		dfs(v, u);
		dp[u] = max(dp[u], dp[v]+cost);
		a[u].push_back(dp[v]+cost);
	}
	sort(a[u].begin(), a[u].end());
	reverse(a[u].begin(), a[u].end());
}
 
//dfs for rerooting
int mn;
void dfs2(int u, int p, int T){
	int dpu = dp[u];
	for(auto X : edges[u]){
		int v = X.first;
		int cost = X.second;
		if(v == p)continue;
		int tmp = dp[v];
		if(dp[v]+cost == a[u][0])dp[u] = a[u][1];
		if(u != p)dp[u] = max(dp[u], dp[p] + T);
		dp[v] = max(dp[v], dp[u] + cost);
		mn = min(mn, dp[v]);
		dfs2(v, u, cost);
		dp[v] = tmp;
		dp[u] = dpu;
	}
}
 
//calculate best center for the tree
int calculate_center(int u){
	dfs(u, u);
	mn = dp[u];
	dfs2(u, u ,0);
	return mn;
}
int travelTime(int _N, int M, int L, int A[], int B[], int T[]) {
	n = _N;
	for(int i=0;i<M;i++){
		edges[A[i]].push_back({B[i], T[i]});
		edges[B[i]].push_back({A[i], T[i]});
	}
	vector<int> v;
	for(int i=0;i<n;i++){
		if(!used[i]){
			v.push_back(calculate_center(i));
		}
	}v.push_back(0);
	sort(v.begin(), v.end());
	reverse(v.begin(), v.end());
	if(v.size() == 0){
		return 0;
	}
	else if(v.size() == 1){
		return a[0][0] + a[0][1];
	}
	else {
		int m = 0;
		for(int i=0;i<n;i++){
			m = max(m, a[i][0]);
		}
		return max(max(v[0]+v[1]+L, v[1]+v[2]+L*2), m);
	}
}

Subtask #1
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 99 ms 17176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 99 ms 17176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 99 ms 17176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 49 ms 10996 KB Output is correct
2 Correct 52 ms 10996 KB Output is correct
3 Correct 51 ms 11380 KB Output is correct
4 Correct 48 ms 11380 KB Output is correct
5 Correct 49 ms 11424 KB Output is correct
6 Correct 52 ms 12020 KB Output is correct
7 Correct 52 ms 11764 KB Output is correct
8 Correct 47 ms 11268 KB Output is correct
9 Correct 49 ms 11252 KB Output is correct
10 Correct 52 ms 11636 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 21 ms 9080 KB Output is correct
13 Correct 21 ms 9208 KB Output is correct
14 Correct 20 ms 9080 KB Output is correct
15 Correct 21 ms 9080 KB Output is correct
16 Correct 21 ms 9080 KB Output is correct
17 Correct 23 ms 9080 KB Output is correct
18 Correct 21 ms 9072 KB Output is correct
19 Correct 20 ms 9080 KB Output is correct
20 Incorrect 4 ms 4992 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 99 ms 17176 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 99 ms 17176 KB Output isn't correct
2 Halted 0 ms 0 KB -