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Submission #681762

# Submission time Handle Problem Language Result Execution time Memory
681762 2023-01-14T07:57:59 Z iskhakkutbilim Shymbulak (IZhO14_shymbulak) C++14
50 / 100
 1500 ms 10972 KB 
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int M = 1e9 + 7;
const int N = 1e6 + 1;

main(){
   ios::sync_with_stdio(0);
   cin.tie(0); cout.tie(0);
	int n; cin >> n;
	vector<int> g[n+1];
	vector<int> answer(n+n,0); 
	int max_distance = 0;
	for(int i = 0;i < n; i++){
		int a, b; cin >> a >> b;
		g[a].push_back(b);
		g[b].push_back(a);
	}
	queue<int> q;
	for(int i = 1;i <= n; i++){
		vector<int> dis(n+1,-1), cnt(n+1,0);
		dis[i] = 0; q.push(i); cnt[i] = 1;
		while(!q.empty()){
			int v = q.front(); q.pop();
			for(int to : g[v]){
				if(dis[to] == -1){
					dis[to] = dis[v]+1;
					cnt[to] = cnt[v]; 
					answer[dis[to]]+= cnt[v];
					q.push(to);
				}else if(dis[to] == dis[v]+1){
					cnt[to]+= cnt[v];
					answer[dis[to]]+= cnt[v];
				}
				max_distance = max(max_distance, dis[to]);
			}
		}
	}
//	cout << max_distance << '\n';
	cout << answer[max_distance]/2;
	return 0;
}

Compilation message

shymbulak.cpp:11:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   11 | main(){
      | ^~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 324 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 0 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 320 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 5 ms 340 KB Output is correct
15 Correct 5 ms 384 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 388 KB Output is correct
2 Correct 10 ms 416 KB Output is correct
3 Correct 19 ms 420 KB Output is correct
4 Correct 21 ms 416 KB Output is correct
5 Correct 513 ms 796 KB Output is correct
6 Correct 386 ms 864 KB Output is correct
7 Correct 631 ms 860 KB Output is correct
8 Correct 554 ms 976 KB Output is correct
9 Correct 526 ms 844 KB Output is correct
10 Correct 547 ms 724 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1595 ms 10972 KB Time limit exceeded
2 Halted 0 ms 0 KB -