#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define ll long long
#define ld long double
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define SZ(x) (int)(x).size()
template <typename T> using ord_set = tree <T, null_type, less <T>, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int n0 = 5003, inf = 1e8;
int n, d[n0][n0], w[n0][n0], used[n0][n0], cnt[n0];
vector <int> g[n0];
queue <int> q;
void bfs(int s) {
q.push(s);
w[s][s] = 1;
used[s][s] = 1;
while (!q.empty()) {
int v = q.front();
q.pop();
for (int to : g[v]) {
if (used[s][to]) continue;
used[s][to] = 1;
if (d[s][to] == d[s][v] + 1) {
w[s][to] += w[s][v];
} else {
d[s][to] = d[s][v] + 1;
w[s][to] = w[s][v];
q.push(to);
}
}
}
}
int main() {
ios_base::sync_with_stdio(false), cin.tie(NULL);
int tc;
//cin >> tc;
tc = 1;
while (tc--) {
//string st;
//cin >> st;
//cout << st << '\n';
cin >> n;
for (int i = 1; i <= n; i++) {
int x, y;
cin >> x >> y;
g[x].pb(y), g[y].pb(x);
}
for (int i = 1; i <= n; i++) {
bfs(i);
for (int j = 1; j <= n; j++) {
cnt[d[i][j]] += w[i][j];
}
}
int ans = -1;
for (int i = n; i >= 1; i--) {
if (cnt[i]) {
ans = cnt[i];
break;
}
}
cout << ans << '\n';
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
512 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
512 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
21 ms |
14720 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
82 ms |
15224 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
