28 lines
547 B
Python
28 lines
547 B
Python
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import sys
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N = dict() # numbers
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E = dict() # expressions
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for l in sys.stdin.read().splitlines():
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k, v = l.split(":")
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v = v.strip()
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if v.isdigit():
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N[k]=int(v)
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else:
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w = v.split(" ")
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E[k]=w
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O = {
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'*': lambda x,y: x*y,
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'+': lambda x,y: x+y,
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'-': lambda x,y: x-y,
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'/': lambda x,y: x/y,
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}
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while len(E)>0:
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D = dict()
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for k,v in E.items():
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(a,o,b) = v
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if a in N and b in N:
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N[k] = O[o](N[a],N[b])
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else:
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D[k] = v
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E = D
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print(N["root"])
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