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arr = [2,3,1,1,4]
def canJump(nums) -> bool:
lastGoodPos = len(nums) - 1
for i in reversed(range(len(nums))):
print(i, nums[i], lastGoodPos, i + nums[i] >= lastGoodPos)
if i + nums[i] >= lastGoodPos:
lastGoodPos = i
return lastGoodPos == 0
canJump(arr)