Month: September 2022

[Solved] counter-intuitive behavior of isset()

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This shouldn’t be at all surprising. Why it evaluates true when $foo is a string: $foo[‘name’] is the same thing as asking for the zeroeth character of $foo when it’s a string – because ‘name’ or ‘camel’ or ‘cigar’ or ‘any other string’ will be coerced into an integral value in that context. array_key_exists() might … Read more

[Solved] vector a[n] allocated in stack or heap? Difference between the declarations vectora(n) and vectora[n]? [duplicate]

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vector<int> adj[n]; This is not legal C++ code, you are not allowed to declare a dynamicaly sized array on the stack like this. It’s also probably the cause of your issue, as making such a huge allocation on the stack can cause some major issues. You should use the following instead: vector<vector<int>> adj(n); 6 solved … Read more

[Solved] Java remove dupplicate attribute in List

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static class Message { String message; long time; public Message(String message, long time) { this.message = message; this.time = time; } } public static void putLatestMessage(Map<String, Message> messageMap, Message message) { if (messageMap.containsKey(message.message) && messageMap.get(message.message).time >= message.time) { return; } else { messageMap.put(message.message, message); } } public static void main(String[] args) { Map<String, Message> messageMap … Read more

[Solved] Solana CPI (runtime) invoke fails when creating a new account by system_instruction::create_account (on-chain program with anchor framework)

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I realized the issue: I did not pass the system_program into instruction. pub system_program: Program<‘info, System> Need to use invoke_signed to also let pda to sign invoke_signed( &create_acc_ix, &[ self.minter.clone(), self.mint_pda_acc.clone(), ], &[&[ &mint_seed.as_ref(), &[*bump_seed] ]] )?; solved Solana CPI (runtime) invoke fails when creating a new account by system_instruction::create_account (on-chain program with anchor framework)

[Solved] Python Linked list minimum value

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Answering this specifically would be difficult without knowing the specifics of your node implementation, and as this is almost certainly a homework problem wouldn’t be sporting anyway. What you want to do is go through each element of the list, and compare it to the Min you have. If it’s higher, then just go to … Read more

[Solved] Program that counts even digits in given number, but eats the first digit, and sometimes not. How to fix?

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result.php <html> <meta charset=”UTF-8″> <body> <?php $input = $_REQUEST[“Input”]; $count = 0; for ($i = 0; $i < $input; $i++) { $x = $input % 10; if ($x % 2 == 0) { $count++; } $input = (int)($input / 10); } ?> Числото <?php echo $_POST[“Input”]; ?> съдържа <?php echo $count ?> четни цифри. </body> … Read more

[Solved] How to make socket chat in C++?

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yes it is possible. You could use a library like Boos.Asio which has an example of chat in its documentation : http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/example/chat/posix_chat_client.cpp (client part) 0 solved How to make socket chat in C++?

[Solved] C++ vector data strucure, loop only half of elements

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You need to compute begin and end of your loop, i.e. first and last_exclusive. #include <vector> #include <numeric> #include <iostream> int main(){ std::vector<int> vec(16); std::iota(vec.begin(), vec.end(), 0); size_t first = 3; size_t last_exclusive = 7; //loop using indices for(size_t i = first; i < last_exclusive; i++){ const auto& w = vec[i]; std::cout << w << … Read more

[Solved] How to use “String.prototype” in javascript

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If you were going to augment a built-in prototype to do this, it would make more sense to augment Element.prototype, not String.prototype, since what you’re trying to use hide on isn’t a string, it’s an HTMLElement instance (which inherits from Element). But it’s usually not a good idea to augment/extend the built-in prototypes. It’s fragile. … Read more

[Solved] Sum multiple columns by group [duplicate]

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Use the “data.table” package! The syntax is much easier, and the run time is faster. ### Load package require(data.table) ### Set up variables; Create data.table time <- c(0:4, 7) ColA <- c(1, 3, 0, 3, 4, 10) ColB <- c(10, 7, 8, 4, 5, 23) ColC <- c(5, 15, 9, 5, 6, 4) data <- … Read more

[Solved] How to show all DB result with PDO

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The answer is as follows: <?php $sql = “SELECT * FROM database WHERE id BETWEEN 1 AND 5″; $stmt = $conn->query($sql); $stmt->execute(); while($row = $stmt->fetch(PDO::FETCH_OBJ)){ ?> <tr> <td><b><?php echo $row->hours ?></b></td> <td><a href=”#”></a></td> <td id=”dayhour-1″> <input type=”text” class=”form-control” id=”1″ value=”<?php echo $row->username ?>”> </td> </tr> <?php } ?> This code will do it’s work. Its … Read more