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Commit2e4a38e

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463-island-perimeter.md Simplified Python solution.
1 parent093670d commit2e4a38e

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‎en/1-1000/463-island-perimeter.md‎

Lines changed: 22 additions & 25 deletions
Original file line numberDiff line numberDiff line change
@@ -71,38 +71,35 @@ And this graph has only one **connected components** (island).
7171
```python
7272
classSolution:
7373
def__init__(self):
74-
self.perimeter=0
7574
self.grid=None
7675

7776
defislandPerimeter(self,grid: List[List[int]]) ->int:
7877
self.grid= grid
78+
perimeter=0
7979

80-
for i, rowinenumerate(self.grid):
81-
for j, valueinenumerate(row):
82-
if value==1:
83-
self.perimeter+=self.water_edges(i, j)
84-
85-
returnself.perimeter
86-
87-
defwater_edges(self,i,j):
88-
result=0
89-
result+=self.water_edge(i-1, j)
90-
result+=self.water_edge(i, j+1)
91-
result+=self.water_edge(i+1, j)
92-
result+=self.water_edge(i, j-1)
93-
return result
80+
for iinrange(len(grid)):
81+
for jinrange(len(grid[0])):
82+
if grid[i][j]==1:
83+
perimeter+=self.water_side_count(i, j)
9484

95-
defwater_edge(self,i,j):
96-
if i<0or i>=len(self.grid):
97-
return1
85+
return perimeter
9886

99-
if j<0or j>=len(self.grid[0]):
100-
return1
101-
102-
ifself.grid[i][j]==0:
103-
return1
104-
105-
return0
87+
defwater_side_count(self,i,j):
88+
side_count=0
89+
90+
for a, bin [
91+
(-1,0),
92+
(0,-1), (0,1),
93+
(1,0),
94+
]:
95+
m= i+ a
96+
n= j+ b
97+
98+
if m<0or n<0or m>=len(self.grid)or n>=len(self.grid[0]) \
99+
orself.grid[m][n]==0:
100+
side_count+=1
101+
102+
return side_count
106103
```
107104

108105
###Solution 2: Depth-First Search the Island (complex way)

‎zh/1-1000/463-island-perimeter.md‎

Lines changed: 22 additions & 25 deletions
Original file line numberDiff line numberDiff line change
@@ -71,38 +71,35 @@ And this graph has only one **connected components** (island).
7171
```python
7272
classSolution:
7373
def__init__(self):
74-
self.perimeter=0
7574
self.grid=None
7675

7776
defislandPerimeter(self,grid: List[List[int]]) ->int:
7877
self.grid= grid
78+
perimeter=0
7979

80-
for i, rowinenumerate(self.grid):
81-
for j, valueinenumerate(row):
82-
if value==1:
83-
self.perimeter+=self.water_edges(i, j)
84-
85-
returnself.perimeter
86-
87-
defwater_edges(self,i,j):
88-
result=0
89-
result+=self.water_edge(i-1, j)
90-
result+=self.water_edge(i, j+1)
91-
result+=self.water_edge(i+1, j)
92-
result+=self.water_edge(i, j-1)
93-
return result
80+
for iinrange(len(grid)):
81+
for jinrange(len(grid[0])):
82+
if grid[i][j]==1:
83+
perimeter+=self.water_side_count(i, j)
9484

95-
defwater_edge(self,i,j):
96-
if i<0or i>=len(self.grid):
97-
return1
85+
return perimeter
9886

99-
if j<0or j>=len(self.grid[0]):
100-
return1
101-
102-
ifself.grid[i][j]==0:
103-
return1
104-
105-
return0
87+
defwater_side_count(self,i,j):
88+
side_count=0
89+
90+
for a, bin [
91+
(-1,0),
92+
(0,-1), (0,1),
93+
(1,0),
94+
]:
95+
m= i+ a
96+
n= j+ b
97+
98+
if m<0or n<0or m>=len(self.grid)or n>=len(self.grid[0]) \
99+
orself.grid[m][n]==0:
100+
side_count+=1
101+
102+
return side_count
106103
```
107104

108105
###Solution 2: Depth-First Search the Island (complex way)

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