This question is tagged with dp, therefore I thought this could be solved with dp, I Tried but couldn't find the transition states.can anyone help ?? please.
# | User | Rating |
---|---|---|
1 | tourist | 3757 |
2 | jiangly | 3647 |
3 | Benq | 3581 |
4 | orzdevinwang | 3570 |
5 | Geothermal | 3569 |
5 | cnnfls_csy | 3569 |
7 | Radewoosh | 3509 |
8 | ecnerwala | 3486 |
9 | jqdai0815 | 3474 |
10 | gyh20 | 3447 |
# | User | Contrib. |
---|---|---|
1 | maomao90 | 171 |
2 | awoo | 165 |
3 | adamant | 163 |
4 | TheScrasse | 159 |
5 | maroonrk | 155 |
6 | nor | 154 |
7 | -is-this-fft- | 152 |
8 | Petr | 147 |
9 | orz | 145 |
9 | pajenegod | 145 |
This question is tagged with dp, therefore I thought this could be solved with dp, I Tried but couldn't find the transition states.can anyone help ?? please.
Name |
---|
My submission
Let
cnt[i]
be the count of indices wherea[j] < j
for all $$$1\leq j \leq i$$$. The transition would becnt[i] = cnt[i-1] + (1 if a[i] < i)
. The final answer would then be $$$\sum_{i=1}^{n} \text{cnt}[a[i]-1]$$$.thanks