When compiling that from the command line, I get the following (after about
6 seconds):
test.swift:7:18: error: cannot assign through subscript: 'dp' is a 'let'
constant
dp[0][0] = 0
~~ ^
/.../
After fixing that (changing let dp to var dp), it will compile
successfully, still taking a very long time though. This usually means that
some expression(s) in the code happen to be a bit hard on the type checker
(in its current state).
I tried the latest dev snapshot and it is a bit faster, perhaps 3 s instead
of 6.
Anyway, here is a logically equivalent rewrite which will compile faster:
class Solution {
func rob(nums: [Int]) -> Int {
guard nums.count > 0 else { return 0 }
var dp = Array.init(repeating: Array.init(repeating: 0, count:
nums.count),
count: 2)
dp[0][0] = 0
dp[0][1] = nums[0]
for i in 1 ..< nums.count {
let dp_iMinus1_0 = dp[i - 1][0]
let dp_iMinus1_1 = dp[i - 1][1]
dp[i][0] = max(dp_iMinus1_0, dp_iMinus1_1)
dp[i][1] = dp_iMinus1_0 + nums[i]
}
return 0
}
}
On Mon, Jun 5, 2017 at 2:32 PM, Hbucius Smith via swift-users <
swift-users@swift.org> wrote:
> Hi Swift-Users,
>
> when I compiled the code, Xcode cannot stop, I do not know why. It is
> very strange. Can anyone help ? Here is the code. I am using Xcode 8.1
>
> class Solution {
>
> func rob(nums: [Int]) -> Int {
>
> guard nums.count > 0 else { return 0 }
>
> let dp = Array.init(repeating: Array.init(repeating: 0, count:
> nums.count),
>
> count: 2)
>
> dp[0][0] = 0
>
> dp[0][1] = nums[0]
>
> for i in 1 ..< nums.count {
>
> dp[i][0] = max(dp[i - 1][0], dp[i - 1][1])
>
> dp[i][1] = dp[i - 1][0] + nums[i]
>
> }
>
> return 0
>
> }
>
> }
>
>
>
> *best wishes for you *
>
> _______________________________________________
> swift-users mailing list
> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users
>
>
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