oj.uz

Submission #468621

# Submission time Handle Problem Language Result Execution time Memory
468621 2021-08-29T04:35:41 Z jazzup Dreaming (IOI13_dreaming) C++14
18 / 100
 56 ms 15936 KB 
#include "dreaming.h"
#include <queue>
#include <vector>
#include <utility>
#include <algorithm>
#include <cmath>

using namespace std;

int dis1[100010],dis2[100010];
bool visited[100010];
vector<pair<int,int> > v[100010],pb;
vector<int> pa,nl,len;
queue<int> q;
pair<int,int> tmp;

int a[100010],b[100010],c[100010];
bool shd;

void dfs(pair<int,int> n){
	visited[n.first]=true;
	nl.push_back(n.first);

	if(dis2[n.first]==n.second){
		double targ=n.second/2.0;
		double dd=targ;
		int pu;
		for(int i=0;i<nl.size();i++){
			double diff=abs((double)dis2[nl[i]]-targ);
			if(diff<=dd){
				dd=diff;
				pu=max(dis2[nl[i]],n.second-dis2[nl[i]]);
			}
		}
		if(!shd){
			len.push_back(pu);
			shd=true;
			tmp=n;
		}
		else if(pu<len.back()){
			len.pop_back();
			len.push_back(pu);
			tmp=n;
		}
	}

	for(int i=0;i<v[n.first].size();i++){
		if(!visited[v[n.first][i].first]){
			dis2[v[n.first][i].first]=dis2[n.first]+v[n.first][i].second;
			dfs(make_pair(v[n.first][i].first,n.second));
		}
	}
	nl.pop_back();
	dis2[n.first]=0;
}

int travelTime(int n, int m, int l, int a[], int b[], int t[]){
	for(int i=0;i<n;i++){
		dis1[i]=-1;
	}

	for(int i=0;i<m;i++){
		v[a[i]].push_back(make_pair(b[i],t[i]));
		v[b[i]].push_back(make_pair(a[i],t[i]));
	}

	for(int i=0;i<n;i++){
		if(dis1[i]==-1){
			dis1[i]=0;
			q.push(i);
			visited[i]=true;	

			int mxd=0,nd=i;

			while(!q.empty()){
				int cur=q.front();
				if(dis1[cur]>mxd){
					mxd=dis1[cur];
					nd=cur;
				}
				q.pop();
				for(int i=0;i<v[cur].size();i++){
					if(!visited[v[cur][i].first]){
						q.push(v[cur][i].first);
						dis1[v[cur][i].first]=dis1[cur]+v[cur][i].second;
						visited[v[cur][i].first]=true;
					}
				}
			}
			pa.push_back(nd);
		}
	}

	for(int i=0;i<n;i++){
		dis1[i]=-1;
		visited[i]=false;
	}

	for(int i=0;i<pa.size();i++){
		dis1[pa[i]]=0;
		q.push(pa[i]);
		visited[pa[i]]=true;	

		int mxd=0,nd=i;

		while(!q.empty()){
			int cur=q.front();
			if(dis1[cur]>mxd){
				mxd=dis1[cur];
				nd=cur;
			}
			q.pop();
			for(int i=0;i<v[cur].size();i++){
				if(!visited[v[cur][i].first]){
					q.push(v[cur][i].first);
					dis1[v[cur][i].first]=dis1[cur]+v[cur][i].second;
					visited[v[cur][i].first]=true;
				}
			}
		}
		pb.push_back(make_pair(nd,mxd));
	}

	for(int i=0;i<n;i++){
		dis2[i]=-1;
		visited[i]=false;
	}

	for(int i=0;i<pb.size();i++){
		dis2[pb[i].first]=0;
		shd=false;
		dfs(pb[i]);
		dfs(tmp);
	}

	sort(len.begin(),len.end());

	int ml=-1;

	for(int i=0;i<n;i++){
		if(dis2[i]>ml){
			ml=dis2[i];
		}
	}

	int yo=n-m;

	int ans=-1;

	if(yo>=3){
		ans=max(len[yo-1]+len[yo-2]+l,len[yo-3]+len[yo-2]+2*l);
	}

	else if(yo==2){
		ans=len[yo-1]+len[yo-2]+l;
	}

	ans=max(ans,ml);
	// printf("%lld\n",yo);
    return ans;
}

Compilation message

dreaming.cpp: In function 'void dfs(std::pair<int, int>)':
dreaming.cpp:28:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   for(int i=0;i<nl.size();i++){
      |               ~^~~~~~~~~~
dreaming.cpp:47:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |  for(int i=0;i<v[n.first].size();i++){
      |              ~^~~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:82:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |     for(int i=0;i<v[cur].size();i++){
      |                 ~^~~~~~~~~~~~~~
dreaming.cpp:99:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |  for(int i=0;i<pa.size();i++){
      |              ~^~~~~~~~~~
dreaming.cpp:113:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  113 |    for(int i=0;i<v[cur].size();i++){
      |                ~^~~~~~~~~~~~~~
dreaming.cpp:129:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |  for(int i=0;i<pb.size();i++){
      |              ~^~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 56 ms 15936 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 56 ms 15936 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 7168 KB Output is correct
2 Correct 45 ms 7280 KB Output is correct
3 Correct 46 ms 7172 KB Output is correct
4 Correct 33 ms 7172 KB Output is correct
5 Correct 44 ms 7124 KB Output is correct
6 Correct 44 ms 7736 KB Output is correct
7 Correct 35 ms 7460 KB Output is correct
8 Correct 33 ms 7056 KB Output is correct
9 Correct 38 ms 7036 KB Output is correct
10 Correct 35 ms 7404 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 12 ms 5568 KB Output is correct
13 Correct 13 ms 5572 KB Output is correct
14 Correct 14 ms 5560 KB Output is correct
15 Correct 13 ms 5584 KB Output is correct
16 Correct 12 ms 5616 KB Output is correct
17 Correct 12 ms 5568 KB Output is correct
18 Correct 13 ms 5568 KB Output is correct
19 Correct 13 ms 5568 KB Output is correct
20 Correct 2 ms 2636 KB Output is correct
21 Correct 2 ms 2636 KB Output is correct
22 Correct 2 ms 2772 KB Output is correct
23 Correct 12 ms 5636 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 56 ms 15936 KB Output isn't correct
2 Halted 0 ms 0 KB -