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| 1 | fun main(args: Array<String>) {
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| 2 | find(Numbers) | |
| 3 | } | |
| 4 | ||
| 5 | fun find(numbers: IntArray, index: Int = 0, data: String = "") {
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| 6 | if (index >= numbers.size) {
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| 7 | if (data.isNotEmpty() && eval(data).compareTo(Result) == 0) | |
| 8 | println("$data = $Result")
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| 9 | } else {
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| 10 | val number = numbers[index].toString() | |
| 11 | if (index == 0) {
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| 12 | find(numbers, 1, number) | |
| 13 | find(numbers, 1, Minus + number) | |
| 14 | } else | |
| 15 | for (operator in Operators) | |
| 16 | find(numbers, index + 1, data + operator + number) | |
| 17 | } | |
| 18 | } | |
| 19 | ||
| 20 | fun eval(data: String) = Expression(data).eval() | |
| 21 | ||
| 22 | val Numbers = intArrayOf(6, 6, 1, 3, 7, 6, 6) | |
| 23 | val Result = BigDecimal("100")
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| 24 | val Operators = arrayOf("+", "-", "/", "*")
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| 25 | val Minus = "-" |
