The best replacement for 2d array is 1d array.

The best alternatives to 2d array are rated as following:
★★★★★  1d array
★★★★  array of arrays
★★★  jagged array

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Speaking about 2d array, one probably shouldn't forget about malloc.

Other search terms related to 2d array and their ratings are:
★★★★★ malloc
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2d array
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