Replace elements of array with elements from another array based on a third array

[Cola_Reb]

Is there a pattern to the statements? It looks like they will either be "No change" or "Change x element to y". How can you convert "x" and "y" to indices?

Yes, the pattern could only consist of 'no change' or the choice of changing a specific element to 1 and all others to 0:

Input should be rplaced by :
'No change' no change
'Change first element to 1', [1, 0, 0, 0]
'Change second element to 1', [0, 1, 0, 0]
'Change third element to 1', [0, 0, 1, 0]
'Change fourth element to 1' [0, 0, 0, 1]