Submission #3594434


Source Code Expand

#include <bits/stdc++.h>
#define MOD 998244353
using namespace std;
typedef long long ll;
int main()
{
	int n, lst = 0;
	cin >> n;
	vector<int> arr(n);
	copy(istream_iterator<int>(cin), istream_iterator<int>(), arr.begin());
	vector<pair<int, int> > bel(n + 1, { -1, -1});
	arr.push_back(arr[0]);
	for (int i = 1; i <= n; i++) {
		if (arr[i] == arr[i - 1]) {
			continue;
		}
		auto &val = bel[arr[i - 1]];
		if (~val.second) {
			cout << 0 << endl;
			return 0;
		}
		val = {lst, i - 1};
		lst = i;
	}
	if (arr[n - 1] == arr[n]) {
		bel[arr[n]].first = lst;
	}
	if (!lst) {
		ll ans = arr[0] == 1;
		for (int i = 1; i <= n; i++) {
			ans = ans * i % MOD;
		}
		cout << ans << endl;
		return 0;
	}
	if (-1 == bel[1].second) {
		cout << 0 << endl;
		return 0;
	}
	auto calc = [&] (auto & rg) { return rg.second - rg.first + (rg.first <= rg.second ? 1 : n + 1); };
	int lim = calc(bel[1]), rem = 0;
	ll ans = 1;
	for (int i = 1; i <= n; i++) {
		if (-1 == bel[i].second) {
			ans = ans * rem-- % MOD;
		} else {
			int l = bel[i].first, r = bel[i].second, len = calc(bel[i]);
			int sum = (arr[r + 1] < i) + (arr[l - 1 + (!l ? n : 0)] < i);
			if (len > lim || (!sum && len != lim)) {
				cout << 0 << endl;
				return 0;
			}
			if (sum == 1) {
				rem += len - 1;
			} else if (sum == 2) {
				rem += lim + len - 2;
				ans = ans * (lim - len + 1) % MOD;
			}
		}
	}
	cout << ans << endl;
	return 0;
}

Submission Info

Submission Time
Task F - Circular
User hawkomg
Language C++14 (GCC 5.4.1)
Score 900
Code Size 1465 Byte
Status AC
Exec Time 100 ms
Memory 6144 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 900 / 900
Status
AC × 4
AC × 103
Set Name Test Cases
Sample s1.txt, s2.txt, s3.txt, s4.txt
All 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 35.txt, 36.txt, 37.txt, 38.txt, 39.txt, 40.txt, 41.txt, 42.txt, 43.txt, 44.txt, 45.txt, 46.txt, 47.txt, 48.txt, 49.txt, 50.txt, 51.txt, 52.txt, 53.txt, 54.txt, 55.txt, 56.txt, 57.txt, 58.txt, 59.txt, 60.txt, 61.txt, 62.txt, 63.txt, 64.txt, 65.txt, 66.txt, 67.txt, 68.txt, 69.txt, 70.txt, 71.txt, 72.txt, 73.txt, 74.txt, 75.txt, 76.txt, 77.txt, 78.txt, 79.txt, 80.txt, 81.txt, 82.txt, 83.txt, 84.txt, 85.txt, 86.txt, 87.txt, 88.txt, 89.txt, 90.txt, 91.txt, 92.txt, 93.txt, 94.txt, 95.txt, 96.txt, 97.txt, 98.txt, 99.txt, s1.txt, s2.txt, s3.txt, s4.txt
Case Name Status Exec Time Memory
01.txt AC 96 ms 4988 KB
02.txt AC 91 ms 4864 KB
03.txt AC 85 ms 4864 KB
04.txt AC 76 ms 4864 KB
05.txt AC 70 ms 4864 KB
06.txt AC 66 ms 4864 KB
07.txt AC 60 ms 4864 KB
08.txt AC 55 ms 4864 KB
09.txt AC 54 ms 4864 KB
10.txt AC 97 ms 4864 KB
11.txt AC 95 ms 4864 KB
12.txt AC 92 ms 4864 KB
13.txt AC 86 ms 4864 KB
14.txt AC 76 ms 4864 KB
15.txt AC 73 ms 4864 KB
16.txt AC 66 ms 4864 KB
17.txt AC 60 ms 4864 KB
18.txt AC 53 ms 4864 KB
19.txt AC 51 ms 4864 KB
20.txt AC 100 ms 4864 KB
21.txt AC 95 ms 6016 KB
22.txt AC 87 ms 4864 KB
23.txt AC 84 ms 4864 KB
24.txt AC 75 ms 4864 KB
25.txt AC 70 ms 4864 KB
26.txt AC 65 ms 4864 KB
27.txt AC 58 ms 4864 KB
28.txt AC 55 ms 4864 KB
29.txt AC 52 ms 4864 KB
30.txt AC 98 ms 4864 KB
31.txt AC 95 ms 4864 KB
32.txt AC 96 ms 4864 KB
33.txt AC 88 ms 4864 KB
34.txt AC 76 ms 4864 KB
35.txt AC 71 ms 4864 KB
36.txt AC 66 ms 4864 KB
37.txt AC 60 ms 4864 KB
38.txt AC 54 ms 4864 KB
39.txt AC 52 ms 5888 KB
40.txt AC 98 ms 4864 KB
41.txt AC 50 ms 4864 KB
42.txt AC 51 ms 4864 KB
43.txt AC 97 ms 4864 KB
44.txt AC 89 ms 4864 KB
45.txt AC 95 ms 4864 KB
46.txt AC 58 ms 5888 KB
47.txt AC 90 ms 4864 KB
48.txt AC 62 ms 4864 KB
49.txt AC 52 ms 4864 KB
50.txt AC 50 ms 4864 KB
51.txt AC 50 ms 4864 KB
52.txt AC 51 ms 4864 KB
53.txt AC 50 ms 4864 KB
54.txt AC 51 ms 5888 KB
55.txt AC 53 ms 6016 KB
56.txt AC 51 ms 4864 KB
57.txt AC 51 ms 4864 KB
58.txt AC 51 ms 4864 KB
59.txt AC 51 ms 4864 KB
60.txt AC 93 ms 4864 KB
61.txt AC 89 ms 4864 KB
62.txt AC 87 ms 4864 KB
63.txt AC 83 ms 4864 KB
64.txt AC 74 ms 4864 KB
65.txt AC 66 ms 5888 KB
66.txt AC 64 ms 4864 KB
67.txt AC 57 ms 4864 KB
68.txt AC 50 ms 4864 KB
69.txt AC 50 ms 4864 KB
70.txt AC 97 ms 6144 KB
71.txt AC 93 ms 4864 KB
72.txt AC 86 ms 6016 KB
73.txt AC 84 ms 5888 KB
74.txt AC 74 ms 4864 KB
75.txt AC 66 ms 4864 KB
76.txt AC 64 ms 4864 KB
77.txt AC 59 ms 4864 KB
78.txt AC 53 ms 4864 KB
79.txt AC 49 ms 4864 KB
80.txt AC 93 ms 4864 KB
81.txt AC 91 ms 4864 KB
82.txt AC 92 ms 4864 KB
83.txt AC 84 ms 4864 KB
84.txt AC 74 ms 4864 KB
85.txt AC 73 ms 5888 KB
86.txt AC 65 ms 4864 KB
87.txt AC 58 ms 4864 KB
88.txt AC 49 ms 4864 KB
89.txt AC 1 ms 256 KB
90.txt AC 1 ms 256 KB
91.txt AC 1 ms 256 KB
92.txt AC 1 ms 256 KB
93.txt AC 1 ms 256 KB
94.txt AC 1 ms 256 KB
95.txt AC 1 ms 256 KB
96.txt AC 1 ms 256 KB
97.txt AC 1 ms 256 KB
98.txt AC 1 ms 256 KB
99.txt AC 1 ms 256 KB
s1.txt AC 1 ms 256 KB
s2.txt AC 1 ms 256 KB
s3.txt AC 1 ms 256 KB
s4.txt AC 1 ms 256 KB