Submission #336126

#	Time	Username	Problem	Language	Result	Execution time	Memory
336126		wind_reaper	Dreaming (IOI13_dreaming)	C++17	14 / 100	1085 ms	7532 KiB

dreaming

#include "dreaming.h"
#include <bits/stdc++.h>
 
using namespace std; 
 
vector<vector<pair<int, int>>> adj; 
vector<int> father, father_dis; 
bitset<100001> vis, vis2;
vector<int> components, c2; 
vector<int> dis; 
void new_comp(int node, int c, int N){
	vis2 = bitset<100001>(0); 
	father.assign(N, -1); 
	father_dis.assign(N, 0); 
	dis.assign(N, 0); 
	queue<pair<int, int>> q;
 
	q.push({node, 0}); 
	int r = 0; 
	while(!q.empty()){
		pair<int, int> cur = q.front(); 
		q.pop(); 
		r++; 
		vis[cur.first] = 1; 
		dis[cur.first] = cur.second; 
		for(pair<int, int> e : adj[cur.first]){
			if(!vis[e.first])
				q.push({e.first, cur.second + e.second}); 
		}
	}
 
	if(r == 1) 
		return; 
 
	int end = max_element(dis.begin(), dis.end()) - dis.begin(); 
	dis.assign(N, 0); 
 
	q.push({end, 0}); 
 
	while(!q.empty()){
		pair<int, int> cur = q.front(); 
		q.pop(); 
		vis2[cur.first] = 1; 
		dis[cur.first] = cur.second; 
		for(pair<int, int> e : adj[cur.first]){
			if(!vis2[e.first]){
				father[e.first] = cur.first;
				father_dis[e.first] = e.second; 
				q.push({e.first, cur.second + e.second}); 
			}
		}
	}
 
	auto it = max_element(dis.begin(), dis.end()); 
	end = it - dis.begin();
	int pops = father[end]; 
	int cur_dis = INT_MAX; 
	int travel = 0; 
	while(pops != -1){
		travel += father_dis[end]; 
		cur_dis = min(cur_dis, max(travel, *it - travel)); 
		end = pops;
		pops = father[end];  
	}
	c2.push_back(*it); 
	components.push_back(cur_dis); 
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    adj.resize(N);  
    for(int i = 0; i < M; i++){
    	adj[A[i]].push_back({B[i], T[i]});
    	adj[B[i]].push_back({A[i], T[i]}); 
    }
    int c = 0; 
    for(int i = 0; i < N; i++){
    	if(!vis[i]){
    		new_comp(i, c++, N);
	    }
    }
   
    sort(components.rbegin(), components.rend()); 
    int max_d = *max_element(c2.begin(), c2.end()); 
    if(c == 1)
    	return components[0]; 
    if(c == 2)
    	return max(max_d, components[0] + components[1] + L); 
    return max({max_d, components[0] + components[1] + L, components[1] + components[2] + 2*L}); 
}

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