Submission #337636

#	Time	Username	Problem	Language	Result	Execution time	Memory
337636		BlancaHM	Dreaming (IOI13_dreaming)	C++14	0 / 100	63 ms	9068 KiB

dreaming

#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>
#include "dreaming.h"
using namespace std;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
typedef vector<vpii> vvpii;

int calcDist(int i, int N, vi & dist1, vi & dist2, vvpii & G, vi & diam) {
	dist1[i] = 0;
	queue<int> Q;
	Q.push(i);
	int u, v, t, maxNode = i;
	vi CC;
	while(!Q.empty()) {
		u = Q.front();
		Q.pop();
		CC.push_back(u);
		if (dist1[u] > dist1[maxNode])
			maxNode = u;
		for (auto connection: G[u]) {
			v = connection.first;
			t = connection.second;
			if (dist1[v] > dist1[u] + t) {
				dist1[v] = dist1[u] + t;
				Q.push(v);
			}
		}
	}
	dist2[maxNode] = 0;
	Q.push(maxNode);
	int curDiameter = 0;
	while(!Q.empty()) {
		u = Q.front();
		curDiameter = max(curDiameter, dist2[u]);
		Q.pop();
		for (auto connection: G[u]) {
			v = connection.first;
			t = connection.second;
			if (dist2[v] > dist2[u] + t) {
				dist2[v] = dist2[u] + t;
				Q.push(v);
			}
		}
	}
	diam.push_back(curDiameter);
	int ecc = 1e9;
	for (auto node: CC)
		ecc = min(ecc, max(dist1[node], dist2[node]));
	return ecc;
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
	vvpii G;
	G.assign(N, vpii());
	for (int i = 0; i < M; i++) {
		G[A[i]].push_back(make_pair(B[i], T[i]));
		G[B[i]].push_back(make_pair(A[i], T[i]));
	}
	vi ecc, dist1, dist2, diam;
	dist1.assign(N, 1e9);
	dist2.assign(N, 1e9);
	for (int i = 0; i < N; i++) {
		if (dist1[i] == 1e9)
			ecc.push_back(calcDist(i, N, dist1, dist2, G, diam));
	}
	sort(ecc.begin(), ecc.end(), greater<int>());
	int ans = 0;
	for (auto d: diam)
		ans = max(ans, d);
	for (int i = 1; i < (int) ecc.size(); i++)
		ans = max(ans, ecc[0]+ecc[i]+L);
	return ans;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 0 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23