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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#232917 | #6410. Classical DP Problem | iulia_morariu | WA | 0ms | 3804kb | C++14 | 1.8kb | 2023-10-31 00:47:12 | 2023-10-31 00:47:13 |
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 < n; 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 = 0;
for(int i = 0; i < n; i++){
bool ok = 1;
for(int j = 0; j <= i; j++){
if(v[j] < i + 1){
ok = 0;
break;
}
}
if(!ok){
k = i;
break;
}
}
if(n == 1) k = 1;
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 *= k;
fact %= Mod;
}
cout << val1 + val2 - fact << endl;
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3608kb
input:
3 1 2 3
output:
2 6
result:
ok 2 number(s): "2 6"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3804kb
input:
1 1
output:
1 1
result:
ok 2 number(s): "1 1"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3612kb
input:
2 1 1
output:
1 2
result:
ok 2 number(s): "1 2"
Test #4:
score: -100
Wrong Answer
time: 0ms
memory: 3620kb
input:
2 2 2
output:
0 -1
result:
wrong answer 1st numbers differ - expected: '2', found: '0'