Created
November 14, 2018 11:53
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| function canCalculate24 (...args) { | |
| const length = args.length | |
| if (length === 2) { | |
| const [ a, b ] = args | |
| let result = (a + b === 24) || (a * b === 24) || (Math.abs(a - b) === 24) || (a > b ? a / b === 24 : b / a === 24) | |
| return result | |
| } else { | |
| for (let i = 0; i < length; i++) { | |
| for (let j = i + 1; j < length; j++) { | |
| const sub = [] | |
| for (let p = 0; p < i; p++) { | |
| sub.push(args[p]) | |
| } | |
| for (let p = i + 1; p < j; p++) { | |
| sub.push(args[p]) | |
| } | |
| for (let p = j + 1; p < length; p++) { | |
| sub.push(args[p]) | |
| } | |
| const a = args[i] | |
| const b = args[j] | |
| let temp = a + b | |
| if (canCalculate24(temp, ...sub)) return true | |
| temp = Math.abs(a - b) | |
| if (canCalculate24(temp, ...sub)) return true | |
| temp = a * b | |
| if (canCalculate24(temp, ...sub)) return true | |
| temp = a / b | |
| if (canCalculate24(temp, ...sub)) return true | |
| temp = b / a | |
| if (canCalculate24(temp, ...sub)) return true | |
| } | |
| } | |
| return false | |
| } | |
| } | |
| const result = [] | |
| for (let i = 1; i < 14; i++) { | |
| for (let j = i; j < 14; j++) { | |
| for (let p = j; p < 14; p++) { | |
| for (let q = p; q < 14; q++) { | |
| if (!canCalculate24(i, j, p, q)) { | |
| result.push([i, j, p, q]) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| console.log(result.length) |
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