Number of island 2

You are given a 2D matrix of size $n \times m$, initially filled with water $0$. You are also given $k$ operations. Each operation consists of a coordinate $(r, c)$ which transforms that water cell into an island $1$. After each operation, you need to determine the total number of distinct islands present in the matrix. An island is a group of connected 1s (horizontal or vertical). Note: If a