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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#145329 | #6410. Classical DP Problem | Insert_Username_Here | WA | 1ms | 3628kb | C++20 | 1.1kb | 2023-08-22 07:30:58 | 2023-08-22 07:30:59 |
Judging History
answer
#include <bits/stdc++.h>
#define f first
#define s second
#define mp make_pair
using namespace std;
typedef long long ll;
const ll mod = 998244353;
// Cope Counter = at least 109
signed main() {
ios::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
ll arr[n + 1][2], dp[n][n];
ll smax = 0, c = 1;
arr[0][0] = arr[0][1] = 0;
for(ll i = n; i > 0; i--) {
cin >> arr[i][0];
for(; c <= arr[i][0]; c++) arr[c][1] = i;
smax = max(smax, min(i + 1, arr[i][0]));
}
for(ll i = 0; i < n; i++) {
for(ll j = 0; j < n; j++) dp[i][j] = 0;
}
dp[0][0] = 1;
ll fact = 1, ans = 0;
for(ll i = 2; i <= smax; i++) fact = fact * i % mod;
if(smax == n) {
cout << n << " " << fact << "\n";
return 0;
}
for(ll bk = 0; bk < 2; bk++) {
for(ll i = 1; i <= smax; i++) {
for(ll j = 1; j <= i; j++) {
dp[i][j] = dp[i - 1][j] + arr[i][bk] - arr[smax + 1][bk] + j;
dp[i][j] += dp[i - 1][j - 1] + arr[smax + 1][bk] - j - 1;
dp[i][j] %= mod;
}
}
ans = (ans + dp[smax][arr[smax][bk]]) % mod;
}
cout << smax << " " << (ans - fact + mod) % mod << "\n";
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 3628kb
input:
3 1 2 3
output:
2 6
result:
ok 2 number(s): "2 6"
Test #2:
score: 0
Accepted
time: 1ms
memory: 3528kb
input:
1 1
output:
1 1
result:
ok 2 number(s): "1 1"
Test #3:
score: -100
Wrong Answer
time: 1ms
memory: 3536kb
input:
2 1 1
output:
1 0
result:
wrong answer 2nd numbers differ - expected: '2', found: '0'