Jingwei jliu90
jliu90
/ longlat.py
Last active
August 29, 2015 14:03
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| #helper function to estimate long/lat range based on long/lat and range in km | |
| def calc_longlat_range(longitude, latitude, range_km): | |
| from math import cos, radians, pi | |
| r = 6370 | |
| alpha = radians(latitude) | |
| circum = 2 * pi * cos(alpha) * r | |
| km_per_long = circum / 360 | |
| km_per_lat = pi * r / 180 |
jliu90
/ post_order.py
Last active
August 29, 2015 14:02
convert in-order and pre-order tree presentation to post-order
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| #test cases | |
| in_order_1 = "ABCDEFG" | |
| pre_order_1 = "DBACEGF" | |
| post_order_1 = "ACBFGED" | |
| in_order_2 = "CBAD" | |
| pre_order_2 = "BCAD" | |
| post_order_2 = "CDAB" | |
| def convert(in_order, pre_order): |