|
| 1 | +// O(n) time and O(1) space |
| 2 | +classSolution { |
| 3 | +funfindErrorNums(nums:IntArray):IntArray { |
| 4 | +val n= nums.size |
| 5 | + |
| 6 | +var x=0 |
| 7 | +var y=0 |
| 8 | +for (iin1..n) { |
| 9 | + x+= nums[i-1]- i |
| 10 | + y+= nums[i-1]* nums[i-1]- i* i |
| 11 | + } |
| 12 | + |
| 13 | +var missing= (y- x* x)/ (2* x) |
| 14 | +var duplicate= missing+ x |
| 15 | + |
| 16 | +return intArrayOf(duplicate, missing) |
| 17 | + } |
| 18 | +} |
| 19 | + |
| 20 | +// Inplace data manipulation O(n) time and O(1) space |
| 21 | +classSolution { |
| 22 | +funfindErrorNums(nums:IntArray):IntArray { |
| 23 | +val res=IntArray (2) |
| 24 | + |
| 25 | +for (iin nums.indices) { |
| 26 | +val n=Math.abs(nums[i]) |
| 27 | + nums[n-1]=-1* nums[n-1] |
| 28 | +if (nums[n-1]>0) |
| 29 | + res[0]= n |
| 30 | + } |
| 31 | + |
| 32 | +for ((i, n)in nums.withIndex()) { |
| 33 | +if (n>0&& i+1!= res[0]) { |
| 34 | + res[1]= i+1 |
| 35 | +break |
| 36 | + } |
| 37 | + } |
| 38 | + |
| 39 | +return res |
| 40 | + } |
| 41 | +} |
| 42 | + |
| 43 | +// HashMap O(n) time and O(n) space |
| 44 | +classSolution { |
| 45 | +funfindErrorNums(nums:IntArray):IntArray { |
| 46 | +val res=IntArray (2) |
| 47 | +val counts= nums |
| 48 | + .asList() |
| 49 | + .groupingBy { it } |
| 50 | + .eachCount() |
| 51 | + |
| 52 | +for (numin1..nums.size) { |
| 53 | +val count= counts[num]?:0 |
| 54 | +if (count==0) |
| 55 | + res[1]= num |
| 56 | +if (count==2) |
| 57 | + res[0]= num |
| 58 | + } |
| 59 | + |
| 60 | +return res |
| 61 | + } |
| 62 | +} |
| 63 | + |
| 64 | +// Use XOR O(n) time and O(1) space |
| 65 | +classSolution { |
| 66 | +funfindErrorNums(nums:IntArray):IntArray { |
| 67 | +val res=IntArray (2) |
| 68 | + |
| 69 | +for (iin nums.indices) { |
| 70 | +val num=Math.abs(nums[i]) |
| 71 | + |
| 72 | + res[1]= res[1] xor ((i+1) xor num) |
| 73 | + |
| 74 | +if (nums[num-1]<0) res[0]= num |
| 75 | +else nums[num-1]*=-1 |
| 76 | + } |
| 77 | + |
| 78 | + res[1]= res[1] xor res[0] |
| 79 | +return res |
| 80 | + } |
| 81 | +} |