LeetCode - 6. Z 字形变换

暴力解法…

/**
 * @param {string} s
 * @param {number} numRows
 * @return {string}
 */
var convert = function(s, numRows) {
    let arr = [];
    
    for (let i = 0; i < numRows; i++) {
        arr.push([]);
    }
    
    let col = 0;
    let idx = 0;
    
    
    while (idx < s.length) {
        
        for (let row = 0; row < numRows; row++) {
            // console.log('down', row, col);
            arr[row][col] = s[idx];
            idx++;
        }
        
        for (let row = numRows - 2; row > 0; row--) {
            col++;
            // console.log('up', row, col);
            arr[row][col] = s[idx];
            idx++;
        }
        col++;
    }
    
    return arr.reduce((str, c) => {
        return str + c.reduce((t, cur) => {
            if (cur) {
                return t + cur;
            }
            return t;
        }, '');
    }, '');
};