我正在解决这个问题:http://codeforces.com/contest/540/problem/C
这似乎是坐标平面上的标准宽度优先搜索,因此基本上,您可以水平或垂直移动,每次移动时都用字符“X”更新新位置的单元格
为了解决这个问题,我必须创建一个所有可能相邻状态对象的列表,其中一个“状态”对象拥有一个位置和一个二维数组(坐标平面/矩阵)。我在下面的“getAdjacentState”类函数中创建相邻“State”对象的列表:
class State(object):
def __init__(self, matrix, curPosition):
self.curMatrix = matrix
self.curPosition = curPosition
def __hash__(self):
hash = 0
mult = 1
for row in range(len(self.curMatrix)):
for col in range(len(self.curMatrix[0])):
if(self.curMatrix[row][col] == 'X'):
hash += mult * 1
mult*=2
return hash
def __eq__(self, other):
for i, row in enumerate(other.curMatrix):
for j, col in enumerate(other.curMatrix[0]):
if not(self.curMatrix[i][j] == other.curMatrix[i][j]):
return False
return True
#adjacentStates
def getAdjacentStates(self):
#calculate a new matrix from curMatrix based on horizontal and vertical position movements
#curMatrix & curPosition
adjStates = list()
if(self.curPosition.column > 0):
# Subtract one from the column of the current position
leftPos = Position(self.curPosition.row, self.curPosition.column - 1)
adjStates.append(createState(self.curMatrix, leftPos))
if(self.curPosition.column < len(self.curMatrix[0]) - 1):
# Add one to the column of the current position
rightPos = Position(self.curPosition.row, self.curPosition.column + 1)
adjStates.append(createState(self.curMatrix, rightPos))
if(self.curPosition.row > 0):
# Subtract one from the current position's row
downPos = Position(self.curPosition.row-1, self.curPosition.column)
adjStates.append(createState(self.curMatrix, downPos))
if(self.curPosition.row < len(self.curMatrix) - 1):
# Add one to the row of the current position
upPos = Position(self.curPosition.row + 1, self.curPosition.column)
adjStates.append(createState(self.curMatrix, upPos))
#print()
return adjStates
附加功能:
def createState(stateMatrix, position):
newMatrix = list()
newMatrix = [stateMatrix[row] for row in range(len(stateMatrix))]
newMatrix[position.row][position.column] = 'X'
return State(newMatrix, position)
所有这些都可以在正确的方向上导航,但是当我打印出给定初始状态的相邻状态列表时:
5 4
.X..
...X
X.X.
....
.XX.
5 3
1 1
我得到三个相同的:
.X..
...X
X.X.
..X.
.XXX
.X..
...X
X.X.
..X.
.XXX
.X..
...X
X.X.
..X.
.XXX
即使它看起来像这样:
.X..
...X
X.X.
....
.XX.
.X..
...X
X.X.
....
.XXX
.X..
...X
X.X.
..X.
.XX.
别介意走到“X”上的缺点
与它应该是什么和我得到什么相比,出于某种原因,相邻的State对象都有指向公共“curMatrix”字段的指针。我不知道为什么,因为在我的'createState'函数中,我创建了一个完全独立的list对象并返回一个新的State对象。你知道吗
如果有人能就如何解决这个问题提供一些建议,我将非常感谢python初学者的帮助,谢谢!你知道吗
完整代码如下:
import queue
class Position(object):
def __init__(self, row, column):
self.row = row
self.column = column
def createState(stateMatrix, position):
newMatrix = list()
newMatrix = [stateMatrix[row] for row in range(len(stateMatrix))]
newMatrix[position.row][position.column] = 'X'
return State(newMatrix, position)
class State(object):
def __init__(self, matrix, curPosition):
self.curMatrix = matrix
self.curPosition = curPosition
def __hash__(self):
hash = 0
mult = 1
for row in range(len(self.matrix)):
for col in range(len(self.matrix[0])):
if(self.matrix[row][col] == 'X'):
hash += mult * 1
mult*=2
return hash
def __eq__(self, other):
for i, row in enumerate(other.curMatrix):
for j, col in enumerate(other.curMatrix[0]):
if not(self.curMatrix[i][j] == other.curMatrix[i][j]):
return False
return True
#adjacentStates
def getAdjacentStates(self):
#calculate a new matrix from curMatrix based on horizontal and vertical position movements
#curMatrix & curPosition
adjStates = list()
if(self.curPosition.column > 0):
# Subtract one from the column of the current position
leftPos = Position(self.curPosition.row, self.curPosition.column - 1)
adjStates.append(createState(self.curMatrix, leftPos))
if(self.curPosition.column < len(self.curMatrix[0]) - 1):
# Add one to the column of the current position
rightPos = Position(self.curPosition.row, self.curPosition.column + 1)
adjStates.append(createState(self.curMatrix, rightPos))
if(self.curPosition.row > 0):
# Subtract one from the current position's row
downPos = Position(self.curPosition.row-1, self.curPosition.column)
adjStates.append(createState(self.curMatrix, downPos))
if(self.curPosition.row < len(self.curMatrix) - 1):
# Add one to the row of the current position
upPos = Position(self.curPosition.row + 1, self.curPosition.column)
adjStates.append(createState(self.curMatrix, upPos))
#print()
return adjStates
#isFinalState
def __repr__(self):
for i, row in enumerate(self.curMatrix):
for j, col in enumerate(self.curMatrix[i]):
print(self.curMatrix[i][j], end='')
print()
n, m = list(map(int, input().split()))
startMatrix = [list(input()) for x in range(n)] #startMatrix[row][column]
startRow, startColumn = list(map(int, input().split()))
startPos = Position(startRow-1, startColumn-1)
endRow, endColumn = list(map(int, input().split()))
endPos = Position(endRow-1, endColumn-1)
initialState = createState(startMatrix, startPos)
testAdj = initialState.getAdjacentStates()
for adj in testAdj:
adj.__repr__()
print()
实际上,您在
adjStates.append(createState(self.curMatrix, xxxPos))
中使用相同的列表我想您需要原始列表的副本,因此将上面的代码更改为:
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