Warm Up · Star Pattern

Alternating 1s and 0s (Global Toggle)

Problem Statement

Write a program to print a triangle of alternating 1s and 0s, but the toggle continues globally across rows.

Global Toggle Variable: Declare toggle = 1 before the outer loop.
Outer Loop: Loop i from 0 to n - 1.
Inner loop: Loop j from 0 to i. On each iteration, append toggle to the row string and flip it (1 -> 0, 0 -> 1).
Print the Row: After the inner loop.

Time Complexity: O(n^2)

Space Complexity: O(n) per row.

Key difference: in the Right-Angled Triangle of Alternating 1s and 0s, toggle = 1 was reset at the start of every row. Here the toggle is declared once, so it keeps alternating across the entire pattern.

Solve it in JavaScript and print the answer with console.log(). Run to see your output, then Submit to check it against the test cases.

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