Find first missing positive: Difference between revisions

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=={{header|FreeBASIC}}==

<lang freebasic>function is_in( n() as integer, k as uinteger ) as boolean

for i as uinteger = 1 to ubound(n)

if n(i) = k then return true

next i

return false

end function

function fmp( n() as integer ) as integer

dim as uinteger i = 1

while is_in( n(), i )

i+=1

wend

return i

end function

dim as integer a(1 to 3) = {1, 2, 0}

dim as integer b(1 to 4) = {3, 4, -1, 1}

dim as integer c(1 to 5) = {7, 8, 9, 11, 12}

print fmp(a())

print fmp(b())

print fmp(c())</lang>

{{out}}<pre>

3

2

1