tsb-migration

Your mission

Look every old account number up in the migration table and write out the new one.

today's brief

April 2018. TSB moves 5.4 million customers onto a new banking platform over one weekend, and on Monday people log in to somebody else's accounts, or to nothing at all. The outage ran for weeks and cost the bank around 330 million pounds. The chief executive resigned. Move every account to its new number.

See it in action

remap(out, {0,1,2,3}, 4, {70,71,72,73}, 4)

Expected result

70 71 72 73

Your checklist

For your own tracking. Tests grade your code.

ids holds n old account numbers, each 0 or more, and out has room for n values.
table holds m new numbers: the old number k became table[k].
out[i] is the new number for ids[i].
An old number with no entry in the table was lost in the move: write -1 for it.

More examples

remap(out, {3,3,0}, 3, {70,71,72,73}, 4)

Expected result

73 73 70

remap(out, {4,0,9}, 3, {70,71,72,73}, 4)

Expected result

-1 70 -1

Constraints

Expected files

migrate.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

tsb-migration

Your mission

Look every old account number up in the migration table and write out the new one.

today's brief

See it in action

remap(out, {0,1,2,3}, 4, {70,71,72,73}, 4)

Expected result

70 71 72 73

Your checklist

For your own tracking. Tests grade your code.

ids holds n old account numbers, each 0 or more, and out has room for n values.
table holds m new numbers: the old number k became table[k].
out[i] is the new number for ids[i].
An old number with no entry in the table was lost in the move: write -1 for it.

More examples

remap(out, {3,3,0}, 3, {70,71,72,73}, 4)

Expected result

73 73 70

remap(out, {4,0,9}, 3, {70,71,72,73}, 4)

Expected result

-1 70 -1

Constraints

Expected files

migrate.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions