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#!/usr/local/bin/node
//
// See ../README.md
//
//
// Run as: node ch-2.js < input-file
//
let DIFF_PER_MINUTE = 11
let MIN_PER_HOUR = 60
let FULL_CIRCLE = 720
require ('readline')
. createInterface ({input: process . stdin})
. on ('line', line => {
let [hours, minutes] = line . trim () . split (":")
angle = (DIFF_PER_MINUTE * (+hours * MIN_PER_HOUR + +minutes)) %
FULL_CIRCLE
if (2 * angle >= FULL_CIRCLE) {
angle = FULL_CIRCLE - angle
}
console . log (angle / 2)
})
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