Created
October 12, 2011 15:12
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GoogleCodeJamJapan2011 決勝 問題A.アンテナ修復
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#!/usr/bin/env python | |
# -*- coding:utf-8 -*- | |
def file_open(filename): | |
T = 0 | |
caseList = [] | |
with open(filename) as f: | |
T = int(f.readline().strip()) | |
for i in range(T): | |
key = int(f.readline().strip()) | |
value = [int(x) for x in f.readline().strip().split()] | |
caseList.append((key, value)) | |
return caseList | |
def sortforthis(elements): | |
""" | |
>>> sortforthis([457, 478, 106, 601, 804]) | |
[804, 601, 457, 106, 478] | |
>>> sortforthis([384, 675, 498, 839]) | |
[839, 675, 384, 498] | |
""" | |
output = [] | |
elements = sorted(elements, reverse = True) | |
is_even = False | |
if len(elements) % 2 == 0: | |
is_even = True | |
else: | |
is_even = False | |
if is_even: | |
output.append(elements[0]) | |
for i in range(1, len(elements), 2): | |
output.append(elements[i]) | |
for i in range(len(elements) - 2 , 1, -2): | |
output.append(elements[i]) | |
else: | |
output.append(elements[0]) | |
for i in range(1, len(elements) -1, 2): | |
output.append(elements[i]) | |
for i in range(len(elements) - 1, 1, -2): | |
output.append(elements[i]) | |
return output | |
def process(caseTuple): | |
import math | |
menseki = 0 | |
numOfElements, elementsList = caseTuple | |
angle = 2 * math.pi / numOfElements | |
elementsList = sortforthis(elementsList) | |
for i in range(numOfElements): | |
j = i + 1 if i < numOfElements - 1 else 0 | |
tmp = math.sin(angle) * elementsList[i] * elementsList[j] / 2 | |
menseki += tmp | |
return menseki | |
def solve(caseList, outputName): | |
f = open(outputName, 'w') | |
for i, T in enumerate(caseList): | |
answer = process(T) | |
f.write("Case #" + str(i + 1) + ": " + str(answer) + "\n") | |
f.close() | |
def _test(): | |
import doctest | |
doctest.testmod() | |
def main(): | |
FILENAME = "A-large.in" | |
OUTPUTNAME = "outputAlarge.txt" | |
A = file_open(FILENAME) | |
solve(A, OUTPUTNAME) | |
if __name__ == "__main__": | |
main() | |
#_test() |
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