10434: USACO 2024 January Contest, Silver Problem 1. Cowmpetency
Description
Because he has interviewed so many cows, Farmer John does not remember all of their cowmpetency scores. However, he does remembers $Q$ ($1 \leq Q < N$) pairs of numbers $(a_j, h_j)$ where cow $h_j$ was the first cow with a strictly greater cowmpetency score than cows $1$ through $a_j$ (so $1 \leq a_j < h_j \leq N$).
Farmer John now tells you the sequence $c_1, \dots, c_N$ (where $c_i = 0$ means that he has forgotten cow $i$'s cowmpetency score) and the $Q$ pairs of $(a_j, h_j)$. Help him determine the lexicographically smallest sequence of cowmpetency scores consistent with this information, or that no such sequence exists! A sequence of scores is lexicographically smaller than another sequence of scores if it assigns a smaller score to the first cow at which the two sequences differ.
Each input contains $T$ $(1 \leq T \leq 20)$ independent test cases. The sum of $N$ across all test cases is guaranteed to not exceed $3 \cdot 10^5$.
Input
- First, a line containing $N$, $Q$, and $C$.
- Next, a line containing the sequence $c_1, \dots, c_N$ $(0 \leq c_i \leq C)$.
- Finally, $Q$ lines each containing a pair $(a_j, h_j)$. It is guaranteed that all $a_j$ within a test case are distinct.
Output
Sample 1 Input
1
7 3 5
1 0 2 3 0 4 0
1 2
3 4
4 5
Sample 1 Output
1 2 2 3 4 4 1
- $\max(c_1) = 1$, $c_2 = 2$ and $1<2$ so the first pair is satisfied
- $\max(c_1,c_2,c_3) = 2$, $c_4 = 3$ and $2<3$ so the second pair is satisfied
- $\max(c_1,c_2,c_3,c_4) = 3$, $c_5 = 4$ and $3<4$ so the third pair is satisfied
1 2 2 3 5 4 1 1 2 2 3 4 4 5However, none of these are lexicographically smaller than the given output.
Sample 2 Input
5
7 6 10
0 0 0 0 0 0 0
1 2
2 3
3 4
4 5
5 6
6 7
8 4 9
0 0 0 0 1 6 0 6
1 3
6 7
4 7
2 3
2 1 1
0 0
1 2
10 4 10
1 2 0 2 1 5 8 6 0 3
4 7
1 2
5 7
3 7
10 2 8
1 0 0 0 0 5 7 0 0 0
4 6
6 9
Sample 2 Output
1 2 3 4 5 6 7
1 1 2 6 1 6 7 6
-1
1 2 5 2 1 5 8 6 1 3
-1
1 1However, in this case, cow 2 does not have a greater score than cow 1, so we cannot satisfy the condition.
In test case 5, $a_1$ and $h_1$ tell us that cow 6 is the first cow to have a strictly greater score than cows 1 through 4. Therefore, the largest score for cows 1 through 6 is that of cow 6: 5. Since cow 7 has a score of 7, cow 7 is the first cow to have a greater score than cows 1 through 6. So, the second statement that cow 9 is the first cow to have a greater score than cows 1 through 6 cannot be true.
SCORING:
- Input 3 satisfies $N \leq 10$ and $Q, C \leq 4$.
- Inputs 4-8 satisfy $N \leq 1000$.
- Inputs 9-12 satisfy no additional constraints.