Count 2D Array Element

题面

统计 2D 整型数组中等于 k 的元素个数，结果写入 output。

Implementation Requirements

• Use only native features (external libraries are not permitted)
• The solve function signature must remain unchanged
• 结果写入 output

Examples

[[1,2,3],[4,5,1]], k=1 → 2
[[5,10],[5,2]], k=1 → 0

Constraints

• 1 ≤ N, M ≤ 10,000
• 1 ≤ input[i], k ≤ 100
• Performance: K=1, M=10,000, N=10,000