題目

解題想法

function convertToArray(grid){
    for(let i=0;i<grid.length;i++){
        grid[i] = grid[i].split('');
    }
    return grid;
}

function gridChallenge(grid) {
    // if grid is 1x1 then just return YES
    if(grid.length==1){
        return 'YES'
    }
    
    grid = convertToArray(grid);
    
    //sort grid
    for(let i=0;i<grid.length;i++){
        grid[i].sort();
    }
    

    //compare verticaly
    let x=0;
    let y=0;
    while(y < grid[0].length){
        if(x==grid.length-1){
            x=0;
            y++;
        }
        if(grid[x][y]>grid[x+1][y]){
            return 'NO'
        }
        x++;
        
    }
    return 'YES';
}

結果