Created
February 14, 2013 16:45
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class Mine(object): | |
def __init__(self, id_, x, y, r): | |
self.neighbours = set() | |
self.id_ = id_ | |
self.x = x | |
self.y = y | |
self.r = r | |
self.dead = False | |
def find_neighbours(self, mines): | |
for mine in mines: | |
if mine is self: | |
continue | |
if (self.x - mine.x)**2 + (self.y - mine.y)**2 <= self.r**2: | |
self.neighbours.add(mine) | |
def merge(self, mines): | |
if self.dead: | |
return | |
c = False | |
neighbours = set(self.neighbours) | |
for neigh in self.neighbours: | |
if self in neigh.neighbours: | |
neighbours |= neigh.neighbours | |
mines.replace(neigh, self) | |
neighbours.remove(neigh) | |
c = True | |
if self in neighbours: | |
neighbours.remove(self) | |
self.neighbours = neighbours | |
return c | |
class Minefield(object): | |
def __init__(self, mines): | |
self.mines = mines | |
def __iter__(self): | |
return iter(self.mines) | |
def replace(self, one, other): | |
self.mines.remove(one) | |
# self.mines.append(other) | |
for mine in mines: | |
if mine is other: | |
continue | |
if one in mine.neighbours: | |
mine.neighbours.remove(one) | |
mine.neighbours.add(other) | |
one.dead = True | |
def loaddata(fname): | |
mines = [] | |
with open(fname) as fd: | |
fd.next() | |
for id_, line in enumerate(fd): | |
x, y, r = map(int, line.strip().split(" ")) | |
mines.append(Mine(id_, x, y, r)) | |
return Minefield(mines) | |
if __name__ == "__main__": | |
mines = loaddata("Downloads/PROBLEMSET/input/B/8.in") | |
for mine in mines: | |
mine.find_neighbours(mines) | |
while any(d.merge(mines) for d in mines): | |
pass | |
for mine in mines: | |
for mine2 in mines: | |
if mine in mine2.neighbours: | |
break | |
else: | |
print mine.id_ |
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