DIY Wooden Ladder

2000ms

262144K

Description:

Let's denote a $$$k$$$-step ladder as the following structure: exactly $$$k + 2$$$ wooden planks, of which

two planks of length at least $$$k+1$$$ — the base of the ladder;
$$$k$$$ planks of length at least $$$1$$$ — the steps of the ladder;

Note that neither the base planks, nor the steps planks are required to be equal.

For example, ladders $$$1$$$ and $$$3$$$ are correct $$$2$$$-step ladders and ladder $$$2$$$ is a correct $$$1$$$-step ladder. On the first picture the lengths of planks are $$$[3, 3]$$$ for the base and $$$[1]$$$ for the step. On the second picture lengths are $$$[3, 3]$$$ for the base and $$$[2]$$$ for the step. On the third picture lengths are $$$[3, 4]$$$ for the base and $$$[2, 3]$$$ for the steps.

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You have $$$n$$$ planks. The length of the $$$i$$$-th planks is $$$a_i$$$. You don't have a saw, so you can't cut the planks you have. Though you have a hammer and nails, so you can assemble the improvised "ladder" from the planks.

The question is: what is the maximum number $$$k$$$ such that you can choose some subset of the given planks and assemble a $$$k$$$-step ladder using them?

Input:

The first line contains a single integer $$$T$$$ ($$$1 \le T \le 100$$$) — the number of queries. The queries are independent.

Each query consists of two lines. The first line contains a single integer $$$n$$$ ($$$2 \le n \le 10^5$$$) — the number of planks you have.

The second line contains $$$n$$$ integers $$$a_1, a_2, \dots, a_n$$$ ($$$1 \le a_i \le 10^5$$$) — the lengths of the corresponding planks.

It's guaranteed that the total number of planks from all queries doesn't exceed $$$10^5$$$.

Output:

Print $$$T$$$ integers — one per query. The $$$i$$$-th integer is the maximum number $$$k$$$, such that you can choose some subset of the planks given in the $$$i$$$-th query and assemble a $$$k$$$-step ladder using them.

Print $$$0$$$ if you can't make even $$$1$$$-step ladder from the given set of planks.

Sample Input:

Sample Output:

Note:

Examples for the queries $$$1-3$$$ are shown at the image in the legend section.

The Russian meme to express the quality of the ladders:

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Informação

Provedor Codeforces

Código CF1197A