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[Problems] Summary of Problems on Arrays
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Find all pairs of integers within an array that sum to a specified value:
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Approach 1: Using hash table (more time efficient)
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Approach 2: Through sorting (more space efficient)
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Given an M x N matrix, if an element is 0, its entire row and column in the matrix should be set to 0.
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You are given a 2-Dimensional array (matrix) and a scale factor. You need to write a method to scale the 2D array according to the scale factor.
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The signature of the method should be
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public static int[][] scale1(int[][] arr, int scale)
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Example: if you are given a 2*3 array and scale factor is 3, the output array will be 6*9; the input and output arrays will be as follows:
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Input
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1 2 3
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4 5 6
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Output
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1 1 1 2 2 2 3 3 3
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1 1 1 2 2 2 3 3 3
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1 1 1 2 2 2 3 3 3
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4 4 4 5 5 5 6 6 6
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4 4 4 5 5 5 6 6 6
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4 4 4 5 5 5 6 6 6
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