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use std::io::{stdout, Write};
use sha3::{Keccak256, Digest};

fn main() {

    let mut stdout = stdout();
    let samples: [u32; 4] = [0xbeced095, 0x42a7b7dd, 0x45e010b9, 0xa86c339e];
    //let samples: [u32; 4] = [0x6ca54da2,  0xfe07a987, 0x45e010b9, 0x036b6384];
    let mut res: [u64; 4] = [0, 0, 0, 0];

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract SC0 {
    address public creare2owner;
    uint256 public smth;

    constructor(address _addr) {
        creare2owner = _addr;
    }

ewrvp7lv7

Etherium gas optimization task by the min function.

pragma solidity ^0.8.0;
contract MinContract {
    function min(uint256 a, uint256 b) public pure returns (uint256) {
        return a < b ? a : b;
    }
}

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Challenge and my solution

At the first stage,

hash benchmark was checked. As expected, shortest 16-bit md5 was faster.

Please, pay attention here: BenchmarkHash_md5-4 2345684 512.6 ns/op¹

6356d331afbb33be325cabba0e49a332
BenchmarkHash_md5-4 2345684 512.6 ns/op

Footnotes

1. Nanoseconds per one operation ↩

ewrvp7lv7

Don't use Pseudorandom number generator rand.Intn(int)!

Each time you set the same seed, you get the same sequence. stackoverflow

package main

import (
	"encoding/gob"
	"fmt"

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package module

import (
	"fmt"
	"strings"
)
func main() {

	str := "fgfwfhh"
  

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package main

import "fmt"
//Pass slice through the function
//function have own slise wich have common part with external slice
//but! if inner slice change own size, external slise isn't changed
func main() {
	arr := make([]byte, 16)
	fmt.Println("hello01", len(arr), arr) //hello01 16 [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
	cutArrSize(arr)