## 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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