From f79c4c9263046ef73c5dfca213e5ca7481991e6f Mon Sep 17 00:00:00 2001 From: Fedor Lyanguzov Date: Sun, 16 May 2021 20:00:28 +0300 Subject: [PATCH] Solve 18.1 and 18.2 with rosettacode.org --- 18/18.py | 126 +++++++++++++++++++ 18/input | 374 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 500 insertions(+) create mode 100644 18/18.py create mode 100644 18/input diff --git a/18/18.py b/18/18.py new file mode 100644 index 0000000..a85dffe --- /dev/null +++ b/18/18.py @@ -0,0 +1,126 @@ +# http://rosettacode.org/wiki/Parsing/Shunting-yard_algorithm#Python +# http://rosettacode.org/wiki/Parsing/RPN_calculator_algorithm#Python +with open("input") as f: + data = f.read().strip().split("\n") + + +def calc(s): + a=[] + b={'+': lambda x,y: y+x, '-': lambda x,y: y-x, '*': lambda x,y: y*x,'/': lambda x,y:y/x,'^': lambda x,y:y**x} + for c in s.split(): + if c in b: a.append(b[c](a.pop(),a.pop())) + else: a.append(int(c)) + return a[0] + +from collections import namedtuple +from pprint import pprint as pp + +OpInfo = namedtuple('OpInfo', 'prec assoc') +L, R = 'Left Right'.split() + +ops = { + '^': OpInfo(prec=4, assoc=R), + '*': OpInfo(prec=2, assoc=L), + '/': OpInfo(prec=3, assoc=L), + '+': OpInfo(prec=2, assoc=L), + '-': OpInfo(prec=2, assoc=L), + '(': OpInfo(prec=9, assoc=L), + ')': OpInfo(prec=0, assoc=L), + } + +NUM, LPAREN, RPAREN = 'NUMBER ( )'.split() + + +def get_input(inp = None): + 'Inputs an expression and returns list of (TOKENTYPE, tokenvalue)' + + if inp is None: + inp = input('expression: ') + tokens = inp.strip().split() + tokenvals = [] + for token in tokens: + if token in ops: + tokenvals.append((token, ops[token])) + #elif token in (LPAREN, RPAREN): + # tokenvals.append((token, token)) + else: + tokenvals.append((NUM, token)) + return tokenvals + +def shunting(tokenvals): + outq, stack = [], [] + table = ['TOKEN,ACTION,RPN OUTPUT,OP STACK,NOTES'.split(',')] + for token, val in tokenvals: + note = action = '' + if token is NUM: + action = 'Add number to output' + outq.append(val) + table.append( (val, action, ' '.join(outq), ' '.join(s[0] for s in stack), note) ) + elif token in ops: + t1, (p1, a1) = token, val + v = t1 + note = 'Pop ops from stack to output' + while stack: + t2, (p2, a2) = stack[-1] + if (a1 == L and p1 <= p2) or (a1 == R and p1 < p2): + if t1 != RPAREN: + if t2 != LPAREN: + stack.pop() + action = '(Pop op)' + outq.append(t2) + else: + break + else: + if t2 != LPAREN: + stack.pop() + action = '(Pop op)' + outq.append(t2) + else: + stack.pop() + action = '(Pop & discard "(")' + table.append( (v, action, ' '.join(outq), ' '.join(s[0] for s in stack), note) ) + break + table.append( (v, action, ' '.join(outq), ' '.join(s[0] for s in stack), note) ) + v = note = '' + else: + note = '' + break + note = '' + note = '' + if t1 != RPAREN: + stack.append((token, val)) + action = 'Push op token to stack' + else: + action = 'Discard ")"' + table.append( (v, action, ' '.join(outq), ' '.join(s[0] for s in stack), note) ) + note = 'Drain stack to output' + while stack: + v = '' + t2, (p2, a2) = stack[-1] + action = '(Pop op)' + stack.pop() + outq.append(t2) + table.append( (v, action, ' '.join(outq), ' '.join(s[0] for s in stack), note) ) + v = note = '' + return table + + +def rpn(s): + s = s.replace('(', ' ( ').replace(')', ' ) ') + rp = shunting(get_input(s)) + return rp[-1][2] + + +print(sum(calc(rpn(s)) for s in data)) + +ops = { + '^': OpInfo(prec=4, assoc=R), + '*': OpInfo(prec=2, assoc=L), + '/': OpInfo(prec=3, assoc=L), + '+': OpInfo(prec=3, assoc=L), + '-': OpInfo(prec=2, assoc=L), + '(': OpInfo(prec=9, assoc=L), + ')': OpInfo(prec=0, assoc=L), + } +print(sum(calc(rpn(s)) for s in data)) + diff --git a/18/input b/18/input new file mode 100644 index 0000000..25d9c63 --- /dev/null +++ b/18/input @@ -0,0 +1,374 @@ +(8 * 4 + 6 + (7 + 3 * 9 + 4 * 3) + 2 + 2) * 3 * 8 * 2 * 9 * (5 * 5 * 2 * 6) +3 + 4 + 2 * ((6 * 2 + 4 + 5 * 6 * 8) + (3 * 8 * 6 + 8 * 7) + 2 + (7 + 3) * 9 * 5) * 8 +(4 + 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