diff options
| -rw-r--r-- | challenge-074/walt-mankowski/python/ch-2.py | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/challenge-074/walt-mankowski/python/ch-2.py b/challenge-074/walt-mankowski/python/ch-2.py new file mode 100644 index 0000000000..1c1d4e1609 --- /dev/null +++ b/challenge-074/walt-mankowski/python/ch-2.py @@ -0,0 +1,21 @@ +from sys import argv + +s = argv[1] +seen = set() +nr = [] +out = [] + +for c in s: + # have we seen c before? + if c not in seen: + # add c to nr + seen.add(c) + nr.append(c) + else: + # remove c from nr + nr.remove(c) + + # now the FNR is either the last element of nr, or # + out.append(nr[-1] if nr else '#') + +print(''.join(out)) |