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4张牌算24
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| /* | |
| * Author: <yanxi@yanxi.com> | |
| * $ curl https://gist.github.com/yanxi-com/8754172/raw/gistfile1.js > 24.js | |
| * $ npm install underscore | |
| * $ node 24.js 8 8 9 7 | |
| */ | |
| var _ = require('underscore'); | |
| function add(a, b) { | |
| return a+b; | |
| }; | |
| function minus(a, b) { | |
| return Math.abs(a-b); | |
| }; | |
| function multi(a, b) { | |
| return a*b; | |
| }; | |
| function divide(a, b) { | |
| return Math.max(a,b)/Math.min(a,b); | |
| }; | |
| var ops = [add, minus, multi, divide]; | |
| var name = ['+', '-', '*', '/']; | |
| var nums = _.map(process.argv.slice(2, 6), function(num){return parseInt(num)}); | |
| var _2 = function(a, b) { | |
| var results = []; | |
| for (var i in ops) { | |
| var how = a[1] + '(' + Math.max(a[0],b) + name[i] + Math.min(a[0],b) + ')'; | |
| results.push([ops[i](a[0],b), how]); | |
| } | |
| return results; | |
| }; | |
| var _3 = function(a, b, c) { | |
| var result = []; | |
| _.each(_2([a, ''],b), function(ab) { | |
| result = result.concat(_2(ab, c)) | |
| }); | |
| _.each(_2([a, ''],c), function(ab) { | |
| result = result.concat(_2(ab, b)) | |
| }); | |
| _.each(_2([c, ''],b), function(ab) { | |
| result = result.concat(_2(ab, a)) | |
| }); | |
| return result; | |
| } | |
| var _4 = function(a,b,c,d) { | |
| var result = []; | |
| _.each(_3(a,b,c), function(ab) { | |
| result = result.concat(_2(ab, d)) | |
| }); | |
| _.each(_3(a,b,d), function(ab) { | |
| result = result.concat(_2(ab, c)) | |
| }); | |
| _.each(_3(d,b,c), function(ab) { | |
| result = result.concat(_2(ab, a)) | |
| }); | |
| _.each(_3(a,c,d), function(ab) { | |
| result = result.concat(_2(ab, b)) | |
| }); | |
| return result; | |
| } | |
| var results = _.uniq(_4(nums[0],nums[1],nums[2],nums[3]), false, function(result){ | |
| return result[1]; | |
| }); | |
| _.each(results, function(result){ | |
| if (result[0]>23.99 && result[0]<24.01) { | |
| console.log(result[1] + '=' + result[0]); | |
| } | |
| }) |
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