题目描述：

LeetCode 800. Similar RGB Color

In the following, every capital letter represents some hexadecimal digit from 0 to f.

The red-green-blue color "#AABBCC" can be written as "#ABC" in shorthand.  For example, "#15c" is shorthand for the color "#1155cc".

Now, say the similarity between two colors "#ABCDEF" and "#UVWXYZ" is -(AB - UV)^2 - (CD - WX)^2 - (EF - YZ)^2.

Given the color "#ABCDEF", return a 7 character color that is most similar to #ABCDEF, and has a shorthand (that is, it can be represented as some "#XYZ"

Example 1:
Input: color = "#09f166"
Output: "#11ee66"
Explanation:
The similarity is -(0x09 - 0x11)^2 -(0xf1 - 0xee)^2 - (0x66 - 0x66)^2 = -64 -9 -0 = -73.
This is the highest among any shorthand color.

Note:

• color is a string of length 7.
• color is a valid RGB color: for i > 0, color[i] is a hexadecimal digit from 0 to f
• Any answer which has the same (highest) similarity as the best answer will be accepted.
• All inputs and outputs should use lowercase letters, and the output is 7 characters.

题目大意：

color (r, g, b) 与目标 icolor (ir, ig, ib)的距离为 sum((r - ir) ^ 2 + (g - ig) ^ 2 + (b - ib) ^ 2)

Python代码：

class Solution(object):
def similarRGB(self, color):
"""
:type color: str
:rtype: str
"""
ir, ig, ib = (int(color[x: x+2], 16)
for x in (1, 3, 5))
ans = ()
delta = 0x7FFFFFFF
for r in range(16):
for g in range(16):
for b in range(16):
ndelta = sum((ic - c * 17) ** 2
for ic, c in zip((ir, ig, ib), (r, g, b)))
if ndelta < delta:
delta = ndelta
ans = r, g, b
return '#' + ''.join(hex(c) * 2 for c in ans)

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