27 lines
725 B
Text
27 lines
725 B
Text
# First position is built-in
|
|
haystack := Eratosthenes(10000);;
|
|
needle := 8999;;
|
|
Position(haystack, needle);
|
|
# 1117
|
|
|
|
LastPosition := function(L, x)
|
|
local old, new;
|
|
old := 0;
|
|
new := 0;
|
|
while new <> fail do
|
|
new := Position(L, x, old);
|
|
if new <> fail then
|
|
old := new;
|
|
fi;
|
|
od;
|
|
return old;
|
|
end;
|
|
|
|
a := Shuffle(List([1 .. 100], x -> x mod 10));
|
|
# [ 0, 2, 4, 5, 3, 1, 0, 4, 8, 8, 2, 7, 6, 3, 3, 6, 4, 4, 3, 0, 7, 1, 8, 7, 2, 4, 7, 9, 4, 9, 4, 5, 9, 9, 6, 7, 8, 2, 3,
|
|
# 5, 1, 5, 4, 2, 0, 9, 6, 1, 1, 2, 2, 0, 5, 7, 6, 8, 8, 3, 1, 9, 5, 1, 9, 6, 8, 9, 2, 0, 6, 2, 1, 6, 1, 1, 2, 5, 3, 3,
|
|
# 0, 3, 5, 7, 5, 4, 6, 8, 0, 9, 8, 3, 7, 8, 0, 4, 9, 7, 0, 6, 5, 7 ]
|
|
Position(a, 0);
|
|
# 1
|
|
LastPosition(a, 0);
|
|
# 97
|