Adding Two Negabinary Numbers
给两个以-2为base的数字, 用数字表示, 求他们的合. 这个题和adding binary number那个题一样.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 |
class Solution { public int[] addNegabinary(int[] arr1, int[] arr2) { if (arr1.length == 0) { return arr2; } if (arr2.length == 0) { return arr1; } int i = arr1.length - 1; int j = arr2.length - 1; int carry = 0; List<Integer> list = new ArrayList<>(); while (i >= 0 && j >= 0) { int k = arr1[i] + arr2[j] + carry; list.add((k + 2) % 2); carry = ((k + 2) % 2 - k) / 2; i--; j--; } while (i >= 0) { int k = arr1[i] + carry; list.add((k + 2) % 2); carry = ((k + 2) % 2 - k) / 2; i--; } while (j >= 0) { int k = arr2[j] + carry; list.add((k + 2) % 2); carry = ((k + 2) % 2 - k) / 2; j--; } while (carry != 0) { list.add((carry + 2) % 2); carry = ((carry + 2) % 2 - carry) / 2; } int m = list.size() - 1; while (list.get(m) == 0 && m > 0) { m--; } int[] result = new int[m + 1]; while (m >= 0) { result[result.length - m - 1] = list.get(m); m--; } return result; } } |