USACO

USACO 2024 January Contest, Silver

Problem 1. Cowmpetency

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Farmer John is hiring a new herd leader for his cows. To that end, he has interviewed $N$ ( $2 \leq N \leq 10^5$ ) cows for the position. After interviewing the $i$ th candidate, he assigned the candidate an integer "cowmpetency" score $c_i$ ranging from $1$ to $C$ inclusive ( $1 \leq C \leq 10^9$ ) that is correlated with their leadership abilities.

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 FORMAT (input arrives from the terminal / stdin):

The first line contains

$T$ , the number of independent test cases. Each test case is described as follows:

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 FORMAT (print output to the terminal / stdout):

For each test case, output a single line containing the lexicographically smallest sequence of cowmpetency scores consistent with what Farmer John remembers, or

$-1$ if such a sequence does not exist.

SAMPLE INPUT:

1
7 3 5
1 0 2 3 0 4 0
1 2
3 4
4 5

SAMPLE OUTPUT:

1 2 2 3 4 4 1

We can see that the given output satisfies all of Farmer John's remembered pairs.

$\max(c_1) = 1$ , $c_2 = 2$ 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

There are several other sequences consistent with Farmer John's memory, such as

1 2 2 3 5 4 1
1 2 2 3 4 4 5

However, none of these are lexicographically smaller than the given output.

SAMPLE 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 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

In test case 3, since $C=1$ , the only potential sequence is

1 1

However, 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.

Problem credits: Suhas Nagar

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