Python基于回溯法解决01背包问题实例

bestV=0
curW=0
curV=0
bestx=None
def backtrack(i):
  global bestV,curW,curV,x,bestx
  if i>=n:
    if bestV<curV:
      bestV=curV
      bestx=x[:]
  else:
    if curW+w[i]<=c:
      x[i]=True
      curW+=w[i]
      curV+=v[i]
      backtrack(i+1)
      curW-=w[i]
      curV-=v[i]
    x[i]=False
    backtrack(i+1)
if __name__=='__main__':
  n=5
  c=10
  w=[2,2,6,5,4]
  v=[6,3,5,4,6]
  x=[False for i in range(n)]
  backtrack(0)
  print(bestV)
  print(bestx)