#include <iostream>
#include <cstring>
using namespace std;
int N;
int arr[10005];
int memo[5005][5005][2];
int dp(int idx, int num, int marker){
if(idx >= N) return 0;
if(idx == N - 1) return 1;
if(num > N) return 0;
if(memo[idx][num][marker] != -1) return memo[idx][num][marker];
int summ = 0;
for(int i = 1; i <= num + 1; i++){
if(marker){
if(i == arr[idx + 1]) summ += dp(idx + 1, max(num, i), 1);
else if (i < arr[idx + 1]) summ += dp(idx + 1, num, 0);
else break;
}
else if(i == num + 1) summ += dp(idx + 1, num + 1, 0);
else summ += dp(idx + 1, num, 0);
summ %= 1000007;
}
memo[idx][num][marker] = summ;
return summ;
}
int main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> N;
for(int i = 0; i < N; i++) cin >> arr[i];
memset(memo, -1, sizeof(memo));
cout << dp(0, 1, 1);
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
30 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
28 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
29 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
31 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
41 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
29 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
29 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
31 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
28 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Runtime error |
31 ms |
65540 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |