How should I practice Total Pipeline Completion Time?

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

Is Total Pipeline Completion Time associated with Plaid?

FastPrep tags this as a Plaid phone screen coding practice problem when the problem catalog has that company and stage context.

Total Pipeline Completion Time

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Problem statement

Each row of tasks is [taskTime, taskCount]. A single worker processes every task sequentially. Each of the taskCount tasks in that row takes exactly taskTime time units.

Return the time when all tasks from all rows have completed.

Function

totalPipelineTime(tasks: int[][]) → long

Examples

Example 1

tasks = [[3,4],[5,2]]return = 22

Four three-unit tasks and two five-unit tasks take 12 + 10 time units.

Example 2

tasks = [[7,1]]return = 7

The only task takes seven units.

Example 3

tasks = [[2,0],[4,3]]return = 12

The zero-count row contributes nothing.

Constraints

1 <= tasks.length <= 10^5.
0 <= taskTime, taskCount <= 10^9.
The answer fits a signed 64-bit integer.