Problem Statement
Generate first n rows of Pascal's triangle.
Approach
Each element = sum of two above. row[i][j] = row[i-1][j-1] + row[i-1][j].
Time & Space Complexity
Time O(n²), Space O(n²).

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Generate triangle using binomial coefficients.
Generate first n rows of Pascal's triangle.
Each element = sum of two above. row[i][j] = row[i-1][j-1] + row[i-1][j].
Time O(n²), Space O(n²).
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