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I have this file

5
9
7
23
0
5
7
78
0
3
7
0
5
44
9
0

i want to remove the row with zero value but i want to replace it with the above + under over 2 like this (the second zero) ...

I have this file
0.450908 3
0.491995 43
0.492116 43
0.493203 43
0.493324 43
0.494411 43
0.494532 43
0.495619 43
0.49574 43
0.509831 103
0.535661 5
0.535782 5
0.536869 5 ...

I try both of them but they omit some rows of input file thanks

what does this mean?
awk '!a[$2]||a[$2]>$1 {a[$2]=$1} END {for (i in a) print a[i],i}' file