oj.uz

Submission #468334

# Submission time Handle Problem Language Result Execution time Memory
468334 2021-08-27T16:19:47 Z jazzup Dreaming (IOI13_dreaming) C++17
32 / 100
 88 ms 17484 KB 
#include "dreaming.h"
#include <queue>
#include <vector>
#include <utility>
#include <algorithm>
#include <cmath>

using namespace std;

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

void dfs(pair<long long,long long> 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;
		long long pu;
		for(long long 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]]);
			}
		}
		len.push_back(pu);
	}

	for(long long 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();
}

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

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

			long long mxd=0,nd=i;

			while(!q.empty()){
				long long cur=q.front();
				if(dis1[cur]>mxd){
					mxd=dis1[cur];
					nd=cur;
				}
				q.pop();
				for(long long 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(long long i=0;i<n;i++){
		dis1[i]=-1;
		visited[i]=false;
	}

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

		long long mxd=0,nd=i;

		while(!q.empty()){
			long long cur=q.front();
			if(dis1[cur]>mxd){
				mxd=dis1[cur];
				nd=cur;
			}
			q.pop();
			for(long long 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(long long i=0;i<n;i++){
		dis2[i]=-1;
		visited[i]=false;
	}

	for(long long i=0;i<pb.size();i++){
		dis2[pb[i].first]=0;
		dfs(pb[i]);
	}

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

	long long ml=-1;

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

	long long yo=len.size();

	long long 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);

    return (int)ans;
}

Compilation message

dreaming.cpp: In function 'void dfs(std::pair<long long int, long long int>)':
dreaming.cpp:24:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |   for(long long i=0;i<nl.size();i++){
      |                     ~^~~~~~~~~~
dreaming.cpp:34:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |  for(long long i=0;i<v[n.first].size();i++){
      |                    ~^~~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:68:24: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     for(long long i=0;i<v[cur].size();i++){
      |                       ~^~~~~~~~~~~~~~
dreaming.cpp:85:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |  for(long long i=0;i<pa.size();i++){
      |                    ~^~~~~~~~~~
dreaming.cpp:99:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |    for(long long i=0;i<v[cur].size();i++){
      |                      ~^~~~~~~~~~~~~~
dreaming.cpp:115:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |  for(long long i=0;i<pb.size();i++){
      |                    ~^~~~~~~~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 17464 KB Output is correct
2 Correct 69 ms 17484 KB Output is correct
3 Correct 39 ms 12412 KB Output is correct
4 Correct 10 ms 4940 KB Output is correct
5 Correct 8 ms 3916 KB Output is correct
6 Correct 16 ms 6128 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 31 ms 8036 KB Output is correct
9 Correct 38 ms 10220 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 88 ms 12380 KB Output is correct
12 Correct 81 ms 15260 KB Output is correct
13 Correct 2 ms 2764 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 1 ms 2636 KB Output is correct
6 Correct 2 ms 2672 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 2 ms 2636 KB Output is correct
9 Correct 2 ms 2636 KB Output is correct
10 Correct 2 ms 2672 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Correct 2 ms 2636 KB Output is correct
17 Correct 2 ms 2636 KB Output is correct
18 Correct 2 ms 2636 KB Output is correct
19 Correct 2 ms 2636 KB Output is correct
20 Correct 2 ms 2636 KB Output is correct
21 Incorrect 2 ms 2636 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 17464 KB Output is correct
2 Correct 69 ms 17484 KB Output is correct
3 Correct 39 ms 12412 KB Output is correct
4 Correct 10 ms 4940 KB Output is correct
5 Correct 8 ms 3916 KB Output is correct
6 Correct 16 ms 6128 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 31 ms 8036 KB Output is correct
9 Correct 38 ms 10220 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 88 ms 12380 KB Output is correct
12 Correct 81 ms 15260 KB Output is correct
13 Correct 2 ms 2764 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Correct 2 ms 2636 KB Output is correct
17 Correct 2 ms 2636 KB Output is correct
18 Correct 1 ms 2636 KB Output is correct
19 Correct 2 ms 2672 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 2636 KB Output is correct
23 Correct 2 ms 2672 KB Output is correct
24 Correct 2 ms 2636 KB Output is correct
25 Correct 2 ms 2636 KB Output is correct
26 Correct 2 ms 2636 KB Output is correct
27 Correct 2 ms 2636 KB Output is correct
28 Correct 2 ms 2636 KB Output is correct
29 Correct 2 ms 2636 KB Output is correct
30 Correct 2 ms 2636 KB Output is correct
31 Correct 2 ms 2636 KB Output is correct
32 Correct 2 ms 2636 KB Output is correct
33 Correct 2 ms 2636 KB Output is correct
34 Incorrect 2 ms 2636 KB Output isn't correct
35 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 8940 KB Output is correct
2 Correct 36 ms 8920 KB Output is correct
3 Correct 36 ms 8972 KB Output is correct
4 Correct 35 ms 8912 KB Output is correct
5 Correct 40 ms 8884 KB Output is correct
6 Correct 50 ms 9792 KB Output is correct
7 Correct 49 ms 9252 KB Output is correct
8 Correct 34 ms 8956 KB Output is correct
9 Correct 32 ms 8804 KB Output is correct
10 Correct 35 ms 9144 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 14 ms 8372 KB Output is correct
13 Correct 12 ms 8512 KB Output is correct
14 Correct 12 ms 8488 KB Output is correct
15 Correct 12 ms 8380 KB Output is correct
16 Correct 12 ms 8392 KB Output is correct
17 Correct 12 ms 8480 KB Output is correct
18 Correct 15 ms 8432 KB Output is correct
19 Correct 12 ms 8568 KB Output is correct
20 Correct 2 ms 2688 KB Output is correct
21 Correct 2 ms 2636 KB Output is correct
22 Correct 2 ms 2764 KB Output is correct
23 Correct 13 ms 8380 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 1 ms 2636 KB Output is correct
6 Correct 2 ms 2672 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 2 ms 2636 KB Output is correct
9 Correct 2 ms 2636 KB Output is correct
10 Correct 2 ms 2672 KB Output is correct
11 Correct 2 ms 2636 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Correct 2 ms 2636 KB Output is correct
17 Correct 2 ms 2636 KB Output is correct
18 Correct 2 ms 2636 KB Output is correct
19 Correct 2 ms 2636 KB Output is correct
20 Correct 2 ms 2636 KB Output is correct
21 Incorrect 2 ms 2636 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 17464 KB Output is correct
2 Correct 69 ms 17484 KB Output is correct
3 Correct 39 ms 12412 KB Output is correct
4 Correct 10 ms 4940 KB Output is correct
5 Correct 8 ms 3916 KB Output is correct
6 Correct 16 ms 6128 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 31 ms 8036 KB Output is correct
9 Correct 38 ms 10220 KB Output is correct
10 Correct 2 ms 2764 KB Output is correct
11 Correct 88 ms 12380 KB Output is correct
12 Correct 81 ms 15260 KB Output is correct
13 Correct 2 ms 2764 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Correct 2 ms 2636 KB Output is correct
17 Correct 2 ms 2636 KB Output is correct
18 Correct 1 ms 2636 KB Output is correct
19 Correct 2 ms 2672 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 2636 KB Output is correct
23 Correct 2 ms 2672 KB Output is correct
24 Correct 2 ms 2636 KB Output is correct
25 Correct 2 ms 2636 KB Output is correct
26 Correct 2 ms 2636 KB Output is correct
27 Correct 2 ms 2636 KB Output is correct
28 Correct 2 ms 2636 KB Output is correct
29 Correct 2 ms 2636 KB Output is correct
30 Correct 2 ms 2636 KB Output is correct
31 Correct 2 ms 2636 KB Output is correct
32 Correct 2 ms 2636 KB Output is correct
33 Correct 2 ms 2636 KB Output is correct
34 Incorrect 2 ms 2636 KB Output isn't correct
35 Halted 0 ms 0 KB -