QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#232921 | #6410. Classical DP Problem | iulia_morariu | WA | 0ms | 3848kb | C++14 | 1.7kb | 2023-10-31 01:01:59 | 2023-10-31 01:02:00 |
Judging History
answer
#include <bits/stdc++.h>
#define Mod 1000000007
using namespace std;
int k;
int din(vector <int> a){
int n = a.size();
int x = 0;
int it = n - 1;
if(n == k) x = 0;
else x = a[k];
int dp[n + 1][n + 1];
for(int i = 0; i <= n; i++){
for(int j = 0; j <= n; j++) dp[i][j] = 0;
}
dp[0][ x ] = 1;
for(int i = 0; i < k; i++){
for(int j = 0; j <= x; j++){
// acoperim o cloana neimportanta
dp[i + 1][j] += (a[i] - j) * dp[i][j];
dp[i + 1][j] %= Mod;
// acoperim o coloana importanta
if(j > 0){
dp[i + 1][j - 1] += j * dp[i][j];
dp[i + 1][j - 1] %= Mod;
}
}
}
return dp[k][0];
}
int main(){
cin.tie(0);ios::sync_with_stdio(0);
int n; cin >> n;
vector <int> v(n);
for(int i = 0; i < n; i++) cin >> v[i];
reverse(v.begin(), v.end());
k = n;
for(int i = 0; i < n; i++){
if(v[i] < i + 1){
k = i;
break;
}
}
cout << k << " ";
int val1 = din(v);
//cout << "val1 = " << val1 << endl;
vector<int> v1(n);
for(int i = 0; i < n; i++) v1[i] = 0;
for(int i = 0; i < n; i++){
for(int j = 0; j < v[i]; j++){
v1[j]++;
}
}
//reverse(v1.begin(), v1.end());
int val2 = din(v1);
//cout << "val2 = " << val2 << endl;
int fact = 1;
for(int i = 2; i <= k; i++){
fact *= i;
fact %= Mod;
}
//cout << "fact = " << fact << endl;
cout << val1 + val2 - fact << endl;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3552kb
input:
3 1 2 3
output:
2 6
result:
ok 2 number(s): "2 6"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3848kb
input:
1 1
output:
1 1
result:
ok 2 number(s): "1 1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
2 1 1
output:
1 2
result:
ok 2 number(s): "1 2"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3776kb
input:
2 2 2
output:
2 6
result:
ok 2 number(s): "2 6"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3612kb
input:
3 1 1 1
output:
1 3
result:
ok 2 number(s): "1 3"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3492kb
input:
3 2 2 2
output:
2 9
result:
ok 2 number(s): "2 9"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3808kb
input:
3 3 3 3
output:
3 48
result:
ok 2 number(s): "3 48"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3496kb
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: 3544kb
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: 0ms
memory: 3776kb
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 -912654116
result:
wrong answer 2nd numbers differ - expected: '986189864', found: '-912654116'