This puzzle comes from a contribution on codingame.com (link to the puzzle 
<https://www.codingame.com/games/community/?puzzleId=103>). Any idea to 
solve it efficiently?

Given a list of 1 and 0, you must regroup all the 1 at the begin of the 
list in a minimum number of steps. A step is the interchange of two 
elements located at different positions.
The expected result is the minimum number of steps required to obtain a 
sorted list.

Examples:
1 0 1 0 1 -> 1
0 1 0 1 1 1 0 -> 2

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