QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#232931 | #6410. Classical DP Problem | brianabucur10 | WA | 1ms | 5756kb | C++14 | 1.5kb | 2023-10-31 01:23:05 | 2023-10-31 01:23:05 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
int n, v[5005], a[5005], dp1[5005][5005], dp2[5005][5005], t, k;
long long fact (int n)
{
int p=1;
for (int i=2; i<=n; i++)
{
p*=i;
p%=998244353;
}
return p%998244353;
}
void pd (int v[], int dp[][5005])
{
int x=v[k+1];
dp[0][x]=1;
for (int i=0; i<=k; i++)
{
for (int j=0; j<=v[i+1] && j<=x; j++)
{
dp[i+1][j]+=(1LL*(v[i+1]-j)*dp[i][j]%998244353);
dp[i+1][j]%=998244353;
if (j>0)
{
dp[i+1][j-1]+=(1LL*j*dp[i][j]%998244353);
dp[i+1][j-1]%=998244353;
}
}
}
}
void rotire ()
{
for (int i=1; i<=n; i++)
{
for (int j=1; j<=n; j++)
{
if (v[j]>=i)
a[i]++;
else
break;
}
}
}
int main()
{
//9 1 1 2 5 6 6 6 7 9
cin >> n;
for (int i=1; i<=n; i++)
cin >> v[n-i+1];
for (int i=1; i<=n; i++)
{
bool ok=true;
for (int j=1; j<=i; j++)
{
if (v[j]<i)
ok=false;
}
if (!ok)
break;
else
k=i;
}
rotire();
pd(v,dp1);
pd(a,dp2);
//cout << dp1[k][0] << " " << dp2[k][0];
long long rez=(dp1[k][0]%998244353+dp2[k][0]%998244353-1LL*fact(k)%998244353)%998244353;
cout << k << " " << 1LL*rez%998244353;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 5756kb
input:
3 1 2 3
output:
2 6
result:
ok 2 number(s): "2 6"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5632kb
input:
1 1
output:
1 1
result:
ok 2 number(s): "1 1"
Test #3:
score: 0
Accepted
time: 1ms
memory: 5700kb
input:
2 1 1
output:
1 2
result:
ok 2 number(s): "1 2"
Test #4:
score: 0
Accepted
time: 0ms
memory: 5704kb
input:
2 2 2
output:
2 6
result:
ok 2 number(s): "2 6"
Test #5:
score: 0
Accepted
time: 0ms
memory: 5632kb
input:
3 1 1 1
output:
1 3
result:
ok 2 number(s): "1 3"
Test #6:
score: 0
Accepted
time: 0ms
memory: 5628kb
input:
3 2 2 2
output:
2 9
result:
ok 2 number(s): "2 9"
Test #7:
score: 0
Accepted
time: 0ms
memory: 5700kb
input:
3 3 3 3
output:
3 48
result:
ok 2 number(s): "3 48"
Test #8:
score: 0
Accepted
time: 1ms
memory: 5648kb
input:
5 1 1 3 3 4
output:
3 47
result:
ok 2 number(s): "3 47"
Test #9:
score: 0
Accepted
time: 0ms
memory: 5648kb
input:
10 2 4 5 5 5 5 6 8 8 10
output:
5 864
result:
ok 2 number(s): "5 864"
Test #10:
score: -100
Wrong Answer
time: 1ms
memory: 5736kb
input:
30 6 8 9 9 9 10 13 14 15 15 16 17 17 18 20 22 22 23 23 24 24 25 25 25 27 28 28 29 29 30
output:
17 843284081
result:
wrong answer 2nd numbers differ - expected: '986189864', found: '843284081'