oj.uz

Submission #167468

# Submission time Handle Problem Language Result Execution time Memory
167468 2019-12-08T15:57:54 Z nikatamliani Dreaming (IOI13_dreaming) C++14
18 / 100
 84 ms 14836 KB 
# include "dreaming.h"
# include <bits/stdc++.h>
using namespace std; 
const int N = 2e5 + 10;
int fix[N];
vector < int > pts;
vector < pair < int , int > > edges[N];
void dfs(int x, int p, vector < int > &dist){
	fix[x] = 1;
	pts.push_back(x);
	for(int i = 0; i < edges[x].size(); i ++){
		if(edges[x][i].first != p){
			dist[edges[x][i].first] = dist[x] + edges[x][i].second;
			dfs(edges[x][i].first, x, dist);
		}
	}
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]){
	vector < int > dist_a(N, 0), dist_b(N, 0), cen;
	for(int i = 0; i < M; i ++){
		edges[A[i]].push_back(make_pair(B[i], T[i]));
		edges[B[i]].push_back(make_pair(A[i], T[i]));
	}
	for(int i = 0; i < N; i ++){
		if(fix[i] != 1){
			pts.clear();
			dist_a[i] = 0;  
			dfs(i, 0, dist_a);
			int a = pts[0];
			for(int i = 0; i < pts.size(); i ++){
				if(dist_a[pts[i]] > dist_a[a]) a = pts[i];
			}
			pts.clear();
			dist_a[a] = 0;
			dfs(a, 0, dist_a);
			int b = pts[0];
			for(int i = 0; i < pts.size(); i ++){
				if(dist_a[pts[i]] > dist_a[b]) b = pts[i]; 
			}
			if(M == N - 1) return dist_a[b];
			pts.clear();
			dfs(b, 0, dist_b);
			int res = 1e9;
			for(int i = 0; i < pts.size(); i ++){
				res = min(res, max(dist_a[pts[i]], dist_b[pts[i]]));
			}
			cen.push_back(res);
			pts.clear();
		}
	}
	if(cen.size() == 1) return cen.back();
	else{
        sort(cen.rbegin(), cen.rend());
        int res = 0;
        if(cen.size() >= 2) res = cen[0] + cen[1] + L;
        if(cen.size() >= 3) res = max(res, cen[1] + cen[2] + 2 * L); 
        return res;
	}
}

Compilation message

dreaming.cpp: In function 'void dfs(int, int, std::vector<int>&)':
dreaming.cpp:11:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < edges[x].size(); i ++){
                 ~~^~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:30:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < pts.size(); i ++){
                   ~~^~~~~~~~~~~~
dreaming.cpp:37:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < pts.size(); i ++){
                   ~~^~~~~~~~~~~~
dreaming.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < pts.size(); i ++){
                   ~~^~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 84 ms 14836 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 84 ms 14836 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 84 ms 14836 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 48 ms 8800 KB Output is correct
2 Correct 42 ms 9320 KB Output is correct
3 Correct 42 ms 9256 KB Output is correct
4 Correct 42 ms 9336 KB Output is correct
5 Correct 43 ms 9208 KB Output is correct
6 Correct 48 ms 9720 KB Output is correct
7 Correct 45 ms 9464 KB Output is correct
8 Correct 43 ms 9224 KB Output is correct
9 Correct 41 ms 9208 KB Output is correct
10 Correct 50 ms 9352 KB Output is correct
11 Correct 6 ms 4984 KB Output is correct
12 Correct 14 ms 6900 KB Output is correct
13 Correct 14 ms 6900 KB Output is correct
14 Correct 15 ms 6900 KB Output is correct
15 Correct 15 ms 6900 KB Output is correct
16 Correct 14 ms 6944 KB Output is correct
17 Correct 14 ms 6772 KB Output is correct
18 Correct 14 ms 6900 KB Output is correct
19 Correct 14 ms 6900 KB Output is correct
20 Correct 6 ms 4984 KB Output is correct
21 Correct 6 ms 4984 KB Output is correct
22 Correct 7 ms 5112 KB Output is correct
23 Correct 13 ms 6900 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 84 ms 14836 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 84 ms 14836 KB Output isn't correct
2 Halted 0 ms 0 KB -