the statement vector vector int matrix(100 vector int (50 100) ) declares

Explanation of the C++ Statement

• vector vector int matrix: This declares a 2D vector named "matrix" where each element is a vector.
• (100 vector int): This specifies the initial size of the outer vector to be 100, and each element is a vector of integers.
• (50 100): This specifies the initial size of the inner vectors to be 50, with each element initialized to 100.