How should I practice Sort Tuples by Value and Then Key?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Microsoft phone screen problems in FastPrep.

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Sort Tuples by Value and Then Key

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Problem statement

Each row of pairs is an integer tuple [key, value]. Return all rows ordered by value ascending, then by key ascending when values are equal.

Keep every occurrence of an identical tuple. An empty input returns an empty matrix. Numeric comparisons use signed integer order.

Function

sortValueKeyPairs(pairs: int[][]) → int[][]

Examples

Example 1

pairs = [[4,2],[1,3],[2,2],[1,2]]return = [[1,2],[2,2],[4,2],[1,3]]

Value 2 rows precede value 3; tied values order keys 1, 2, then 4.

Example 2

pairs = []return = []

An empty collection remains empty.

Example 3

pairs = [[2,-1],[-3,-1],[2,-1]]return = [[-3,-1],[2,-1],[2,-1]]

Equal values use numeric key order; repeated identical rows are retained.

Constraints

0 <= pairs.length <= 1000.
Every row has exactly two integers, [key, value].
Both fields lie in [-2000000000,2000000000].