HideousYearlyNonlinearprogramming

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• main.py
main.py
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```
```# Oliver Ni, Grade 9
# Project Code Foundation
# Python 2

A              = ((0, 1), (0, 1))
B              = ((1, 0), (0, 1))
C              = ((0, 1), (1, 0), (1, 0))
BLOCKS         = (A, B, C)
rev            = lambda block: [(-x[0], -x[1]) for x in block[::-1]]
cell_to_coords = lambda c, cell: ((cell - 1) / c, (cell - 1) % c)

def place_block(blocked, r, c, i, j, typ, dire):
block = (BLOCKS[typ], rev(BLOCKS[typ]))[dire]
block += ((0, 0),)

for move in block:
if 0 <= i <= r - 1 and 0 <= j <= c - 1 and not blocked[i][j]:
i += move[0]
j += move[1]
else:
return None

return i, j

for _ in range(5):
inp = map(int, raw_input("> ").split())
(r, c, s, n), blocks = inp[:4], inp[4:]

blocked = [[False for j in range(c)] for i in range(r)]

for b in blocks:
coords = cell_to_coords(c, b)
blocked[coords[0]][coords[1]] = True

i, j = cell_to_coords(c, s)
dire = 0 if j == 0 else 1
typ, ans = 0, ""

for _ in range(100):
nex = place_block(blocked, r, c, i, j, typ, dire)

if nex is not None:
i, j = nex
j += (1, -1)[dire]
ans += "ABC"[typ]
if not 0 <= j <= c - 1: break

typ += 1
typ %= 3

print (ans, ans[::-1])[dire]
```
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