18.py
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#!/usr/bin/python
import sys
class Node:
def __init__(self,value):
self.parentNodes = []
self.childNodes = []
self.weight = 0
self.value = value
def calcWeight(self):
maxWeight = 0
for node in self.parentNodes:
weight = node.weight + node.value
if(weight > maxWeight):
maxWeight = weight
self.weight = maxWeight
def __str__(self):
return str(self.value)
targetNode = None
nodeMap = []
def buildNodeMap(nodeMap):
for i in range(0,len(nodeMap)):
for j in range(0,len(nodeMap[i])):
currentNode = nodeMap[i][j]
if(i != len(nodeMap)-1):
currentNode.childNodes.append(nodeMap[i+1][j])
currentNode.childNodes.append(nodeMap[i+1][j+1])
if(i != 0):
if(j == 0):
currentNode.parentNodes.append(nodeMap[i-1][j])
elif(j == len(nodeMap[i])-1):
currentNode.parentNodes.append(nodeMap[i-1][j-1])
else:
currentNode.parentNodes.append(nodeMap[i-1][j])
currentNode.parentNodes.append(nodeMap[i-1][j-1])
def dijkstraReverse(nodeMap):
for row in nodeMap:
for node in row:
node.calcWeight()
numRow = 0
for line in sys.stdin:
nodeMap.append([])
for elem in line.split():
nodeMap[numRow].append(Node(int(elem)))
numRow += 1
buildNodeMap(nodeMap)
nodeMap.append([])
targetNode = Node(0)
for node in nodeMap[-2]:
targetNode.parentNodes.append(node)
nodeMap[-1].append(targetNode)
dijkstraReverse(nodeMap)
print "Result is: " + str(targetNode.weight)