#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")
#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define pf push_front
#define N 10010
#define M ll(10007)
#define inf 1e9 + 1e9
using namespace std;
//using namespace __gnu_pbds;
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef short int si;
typedef array <int, 3> a3;
typedef array <int, 4> a4;
typedef pair <int, int> pt;
//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
int n, ans, from[N], a[N], siz[N], h[N], l, r;
bool mk[105];
vector <int> val[105];
set <int> st[N];
set <pair <int, int> > setr;
vector <int> g[N];
bool bad;
void dfs_rev(int v)
{
st[v].insert(a[v]);
int lst = -1;
for (auto it : st[v])
{
if (lst != -1 && it - lst != 1) {bad = 1; return;}
lst = it;
}
if (v != 1)
{
int nxt = from[v];
if (sz(st[nxt]) < sz(st[v])) swap(st[v], st[nxt]);
for (auto it : st[v]) st[nxt].insert(it);
}
else if (r - l + 1 != sz(st[v])) bad = 1;
}
bool cmp(int x, int y) {return h[x] > h[y];}
void dfs(int v)
{
siz[v] = 1;
for (auto it : g[v])
{
h[it] = h[v] + 1;
dfs(it);
siz[v] += siz[it];
}
}
int main()
{
//freopen("mining.in", "r", stdin); freopen("mining.out", "w", stdout);
ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) {cin >> a[i]; val[a[i]].pb(i); mk[a[i]] = 1;}
for (int i = 1; i < n; i++)
{
int x, y;
cin >> x >> y;
g[x].pb(y);
from[y] = x;
}
dfs(1);
for (l = 1; l <= 100; l++)
if (mk[l])
for (r = l; r <= 100; r++)
{
if (!mk[r]) break;
if (!(l <= a[1] && a[1] <= r)) continue;
bad = 0;
vector <int> gr; gr.clear();
for (int i = l; i <= r; i++) {gr.pb(val[i][0]); st[val[i][0]].clear();}
sort(gr.begin(), gr.end(), cmp);
for (auto it : gr) {dfs_rev(it); if (bad) break;}
if (!bad) {setr.insert({l, r}); ans++;}
}
for (l = 1; l <= 100; l++)
if (mk[l])
for (r = l; r <= 100; r++)
{
if (!mk[r]) break;
if (!(l <= a[1] && a[1] <= r)) continue;
if (setr.find({l, r}) != setr.end()) continue;
bad = 0;
vector <int> gr; gr.clear();
for (int i = l; i <= r; i++) {gr.pb(val[i].back()); st[val[i].back()].clear();}
sort(gr.begin(), gr.end(), cmp);
for (auto it : gr) {dfs_rev(it); if (bad) break;}
if (!bad) ans++;
}
cout << ans << endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
1024 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
1024 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
1024 KB |
Output isn't correct |
| 4 |
Incorrect |
1 ms |
1024 KB |
Output isn't correct |
| 5 |
Incorrect |
1 ms |
1024 KB |
Output isn't correct |
| 6 |
Correct |
21 ms |
1024 KB |
Output is correct |
| 7 |
Correct |
17 ms |
1024 KB |
Output is correct |
| 8 |
Correct |
6 ms |
1024 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 10 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 11 |
Incorrect |
5 ms |
1408 KB |
Output isn't correct |
| 12 |
Incorrect |
4 ms |
1408 KB |
Output isn't correct |
| 13 |
Correct |
4 ms |
1408 KB |
Output is correct |
| 14 |
Incorrect |
50 ms |
2048 KB |
Output isn't correct |
| 15 |
Incorrect |
41 ms |
2172 KB |
Output isn't correct |
| 16 |
Incorrect |
47 ms |
2048 KB |
Output isn't correct |
| 17 |
Correct |
4 ms |
1408 KB |
Output is correct |
| 18 |
Correct |
4 ms |
1408 KB |
Output is correct |
| 19 |
Incorrect |
26 ms |
1408 KB |
Output isn't correct |
| 20 |
Incorrect |
26 ms |
1408 KB |
Output isn't correct |
