Judge | OJ System Judgment Machine Based on Java

Maybe you could try the following. Here we use tail and head to refer to rows 2 through 14 compared to 1 through 13 (effectively comparing each row with the prior row).

We can use rowSums of differences between each row and the previous row. If the difference is zero, then the result is TRUE (or 1), and the ID would increase for each value of 1 from row to row. These are cumulatively summed with cumsum.

The use of c will make the first ID 1. Also, the cumsum is adjusted by 1 to account for the initial ID of 1.

The data you are getting appears to be tab delimited, as such the following tweak should work fine:

You can't use the equality operator == on the interface values. Even if the dynamic types are the same, the comparison may return false if they have fields with different values. Or it panics if B, C and D aren't comparable to begin with.

Instead you can use reflection and use == on reflect.Type. This solution doesn't require you to update the code if you add more types that implement A.

Conditionally add the s to the string:

Why your code won't work:

• R.id.cleanBtn is an Int ID, not a button. Trying to cast an Int into a Button will crash the app. (Casting is not the same thing as converting--it's promising the compiler that something is also something else already.) IDs are used to search existing view hierarchies for the actual view you want by using something like rootView.findViewById(R.id.cleanBtn), but this strategy isn't practical here since you don't have direct access to the view hierarchy.
• Trying to change the button from the preference listener would only work when you change it. If the user rotates the screen or the exits the app and comes back, the main screen's view will be recreated back in the original position.

The right way to do this is not on the settings screen, but on the main screen. Preferences that are set on a preference screen by default are saved to the "default" shared preferences, and they are saved persistently, so they can be read from anywhere else in your app.

What I would do is read the current value of the preference in the onResume() function of the activity or fragment of your main screen. onResume() will get called every time that screen reappears, so it gives it an opportunity to check and apply the setting the first time the view appears and every time you return from the preferences screen, where the value may have changed.

unfortunately, The random generator doesn't work on-chain. if you want some randoms, you should get it from outside the chain.

reason?

assume you making randoms using block hash or something similar, so users can exploit that by inserting an instruction or values that checks for favorable outcomes and even worse, forcing it to roll back if it's not satisfactory.

so what should we do?

1. try to use oracles like chainlink vrf(verifiable random function)

2. simulate oracle vrf services:

make transaction on-chain that your server listens to it. if this transaction happened, make random number off-chain and callback it from your server.

anchor use randoms like this

As long as i know, in react-router v6 it's the only component that's able to be child of

you can change this code

To expand on my comment: k = 2 can be handled by a linear-time greedy algorithm (push each element of A on a stack, popping the top two elements whenever they exist and sum to tar).

What makes k = 2 different is that if A contains x, y, z with x + y = tar and y + z = tar, then x = z and it doesn't matter which one we remove with y.

More formally, we show by induction on the length of A that no removal causes us to lose the ability to empty the array. This is obvious when A is empty. Inductively, suppose that all arrays shorter than A that can be emptied, can be emptied by any maximal sequence of valid removals. If A can't be emptied, then there's nothing to lose. Otherwise, we can remove some pair p and proceed to empty A. Suppose that we remove some other pair q instead. There are two cases.

1. p and q overlap. As we argued above, the resulting array will be the same, and by assumption we can empty it.

2. p and q do not overlap. Then we can get the same array by removing p then q, or q then p. By assumption and the inductive hypothesis, the former order must allow us to empty the resulting array, so the latter order is also fine.

Push Kit can process messages based on the destination app's status (running in the foreground or background). If you want the app running in the foreground to receive notification messages or data messages, you need to implement the onMessageReceived method. The app will take subsequent actions after receiving the messages.

For more details, you could refer to this Docs. Feel free to contact us if you have any further questions.