0073-set-matrix-zeroes.js

/**
 * Additional Space
 * Array - Tabulation
 * Time O(ROWS * COLS) | Space (ROWS + COLS)
 * https://leetcode.com/problems/set-matrix-zeroes/
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
 var setZeroes = function (matrix) {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];
    const [ _row, _col ] = initTabu(rows, cols);/* Space (ROWS + COLS) */

    fillPlacements(matrix, _row, _col);         /* Time O(ROWS * COLS) | Space (ROWS + COLS) */
    setZero(matrix, _row, _col);                /* Time O(ROWS * COLS) */
};

const initTabu = (rows, cols) => [
    new Array(rows).fill(1),/* Space O(ROWS) */
    new Array(cols).fill(1) /* Space O(COLS) */
];

const fillPlacements = (matrix, _row, _col) => {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];

    for (let row = 0; (row < rows); row++) {/* Time (ROWS) */
        for (let col = 0; (col < cols); col++) {/* Time (COLS) */
            const isZero = (matrix[row][col] === 0);
            if (!isZero) continue;

            _row[row] = 0;                       /* Space (ROWS) */
            _col[col] = 0;                       /* Space (COLS) */
        }
    }
}

const setZero = (matrix, _row, _col) => {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];

    for (let row = 0; (row < rows); row++) {/* Time (ROWS) */
        for (let col = 0; (col < cols); col++) {/* Time (COLS) */
            const canSet = ((_row[row] === 0) || (_col[col] === 0));
            if (!canSet) continue;

            matrix[row][col] = 0;
        }
    }
}

/**
 * Constant Space
 * Time O(ROWS * COLS) | Space (1)
 * https://leetcode.com/problems/set-matrix-zeroes/
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var setZeroes = (matrix) => {
    const _isColZero = isColZero(matrix);/* Time O(ROWS) */

    setEdgesToZero(matrix);                /* Time O(ROWS) */
    setCellsToZero(matrix, _isColZero);   /* Time O(ROWS * COLS) */
}

var isColZero = (matrix) => matrix
    .some((row) => row[0] === 0);/* Time O(ROWS) */

var setEdgesToZero = (matrix) => {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];

    for (let row = 0; (row < rows); row++) {/* Time (ROWS) */
        for (let col = 1; (col < cols); col++) {/* Time (COLS) */
            const canSet = matrix[row][col] === 0;
            if (!canSet) continue;

            matrix[row][0] = 0;
            matrix[0][col] = 0;
        }
    }
}

var setCellsToZero = (matrix, isColZero) => {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];

    for (let row = (rows - 1); (0 <= row); row--) {/* Time (ROWS) */
        for (let col = (cols - 1); (1 <= col); col--) {/* Time (COLS) */
            if (!isZero(matrix, row, col)) continue;

            matrix[row][col] = 0;
        }

        if (isColZero) matrix[row][0] = 0;
    }
}

var isZero = (matrix, row, col) => {
    const [ rowLeftEdge, colTopEdge ] = [ matrix[row][0], matrix[0][col] ];

    return ((rowLeftEdge === 0) || (colTopEdge === 0));
}

/**
 * Constant Space
 * Time O(ROWS * COLS) | Space (1)
 * https://leetcode.com/problems/set-matrix-zeroes/
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
 var setZeroes = (matrix) => {
    const isColZero = setEdgesToZero(matrix);/* Time O(ROWS * COLS) */

    setCellsToZero(matrix);                  /* Time O(ROWS * COLS) */

    const isZero = (matrix[0][0] === 0);
    if (isZero) setFirstRowZero(matrix);     /* Time O(COLS) */

    if (isColZero) setFirstColZero(matrix);  /* Time O(ROWS) */
}

var setCellsToZero = (matrix) => {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];

    for (let row = 1; (row < rows); row++) {/* Time O(ROWS) */
        for (let col = 1; (col < cols); col++) {/* Time O(COLS) */
            const isZero = ((matrix[row][0] === 0) || (matrix[0][col] == 0));
            if (!isZero) continue;

            matrix[row][col] = 0;
        }
    }
}

var setEdgesToZero = (matrix, isColZero = false) => {
    const [ rows, cols ] = [ matrix.length, matrix[0].length ];

    for (let row = 0; (row < rows); row++) {/* Time O(ROWS) */
        if (matrix[row][0] === 0) isColZero = true;

        for (let col = 1; (col < cols); col++) {/* Time O(COLS) */
            const canSet = (matrix[row][col] === 0);
            if (!canSet) continue;
            
            matrix[0][col] = 0;
            matrix[row][0] = 0;
        }
    }

    return isColZero;
}

var setFirstRowZero = (matrix, cols =  matrix[0].length) => {
    for (let col = 0; (col < cols); col++) {/* Time O(COLS) */
        matrix[0][col] = 0;
    }
}

var setFirstColZero = (matrix, rows = matrix.length) => {
    for (let row = 0; (row < rows); row++) {/* Time O(ROWS) */
        matrix[row][0] = 0;
    }
}