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답안 #334227

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
334227 2020-12-08T17:10:51 Z LucaDantas 꿈 (IOI13_dreaming) C++17
0 / 100
 1000 ms 13676 KB 
#include "dreaming.h"
#include<bits/stdc++.h>
using namespace std;

using pii = pair<int,int>;

#define ff first
#define ss second
#define pb push_back

// constexpr int maxn = 1e4+10, inf = 0x3f3f3f3f;
constexpr int maxn = 1e5+10, inf = 0x3f3f3f3f;

vector<pii> g[maxn];
// pair<pii,pii> top[maxn];
bool mark[maxn];
int ans, diam;

// int dfs(int u, int p) {
// 	mark[u] = 1;
// 	for(pii pp : g[u]) {
// 		int v = pp.ff, w = pp.ss;
// 		if(v != p) {
// 			int val = dfs(v, u) + w;
// 			if(val > top[u].ff.ff) top[u].ss = top[u].ff, top[u].ff = {val, v};
// 			else if(val > top[u].ss.ff) top[u].ss = {val, v};
// 		}
// 	}
// 	diam = max(diam, top[u].ff.ff + top[u].ss.ff);
// 	return top[u].ff.ff;
// }

// void dfs2(int u, int p, int up) {
// 	ans = min(ans, max(top[u].ff.ff, up));
// 	// printf("%d %d\n", u, max(top[u].ff.ff, up));
// 	for(pii pp : g[u]) {
// 		int v = pp.ff, w = pp.ss;
// 		if(v != p)
// 			dfs2(v, u,w + max(up,
// 				(v != top[u].ff.ss?top[u].ff.ff:top[u].ss.ff)));
// 	}
// }

int brute(int u, int p) {
	pii top = {0, 0};
	for(pii pp : g[u]) {
		int v = pp.ff, w = pp.ss;
		if(v != p) {
			int val = brute(v, u) + w;
			if(val > top.ff) top.ss = top.ff, top.ff = val;
			else if(val > top.ss) top.ss = val;
		}
	}
	diam = max(diam, top.ff+top.ss);
	return top.ff;
}

int tam[maxn];

void calc(int u, int p) {
	mark[u] = 1;
	ans = min(ans, tam[u]);
	for(pii v : g[u])
		if(v.ff != p)
			calc(v.ff, u);
}

struct ANS
{
	int a, b, c;
	void upd(int x) {
		if(x > a) c = b, b = a, a = x;
		else if(x > b) c = b, b = x;
		else if(x > c) c = x;
	}
	// void db() { printf("ans %d %d %d\n", a, b, c); }
	inline int get(int x) { return max(a+b+x, b+c+2*x); }
} opa;

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
	for(int i = 0; i < M; i++)
		g[A[i]].pb({B[i], T[i]}), g[B[i]].pb({A[i], T[i]});
	// for(int i = 0; i < N; i++)
	// 	if(!mark[i])
	// 		ans = inf, dfs(i, -1), dfs2(i, -1, 0), opa.upd(ans);
	for(int i = 0; i < N; i++)
		tam[i] = brute(i, -1);
	for(int i = 0; i < N; i++)
		if(!mark[i])
			ans = inf, calc(i, -1), opa.upd(ans);
	// opa.db();
	return max(opa.get(L), diam);
}

Subtask #1
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1101 ms 13676 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1101 ms 13676 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1101 ms 13676 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 23 ms 5484 KB Output is correct
2 Correct 27 ms 5424 KB Output is correct
3 Correct 25 ms 5484 KB Output is correct
4 Correct 22 ms 5484 KB Output is correct
5 Correct 24 ms 5484 KB Output is correct
6 Correct 41 ms 5612 KB Output is correct
7 Correct 25 ms 5612 KB Output is correct
8 Correct 21 ms 5356 KB Output is correct
9 Correct 22 ms 5356 KB Output is correct
10 Correct 24 ms 5612 KB Output is correct
11 Correct 3 ms 2668 KB Output is correct
12 Correct 3 ms 3180 KB Output is correct
13 Correct 4 ms 3180 KB Output is correct
14 Correct 4 ms 3180 KB Output is correct
15 Correct 3 ms 3180 KB Output is correct
16 Correct 3 ms 3180 KB Output is correct
17 Correct 3 ms 3180 KB Output is correct
18 Correct 4 ms 3180 KB Output is correct
19 Correct 3 ms 3180 KB Output is correct
20 Incorrect 2 ms 2668 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1101 ms 13676 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1101 ms 13676 KB Time limit exceeded
2 Halted 0 ms 0 KB -