* [221] Maximal Square * * Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area. * * Example: * * * Input: * * 1 0 1 0 0 * 1 0 1 1 1 * 1 1 1 1 1 * 1 0 0 1 0 * * Output: 4 * */
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