a-deal

What are the parameters R, W, and N?

• R | Minimum number of nodes that must participate in a successful read operation
• W | Minimum number of nodes that must participate in a successful write operation
• N | Number of replicas nodes that retain copies of a system's data (or partition thereof)

How many node failures can the system tolerate while still guaranteeing that read operations will return up-to-date values?

• Given that R is the minimum number of replicas to be read from for a read operation to be successful, it stands that N, where N equals the number of healthy replica nodes, must be at least equal to R for an up-to-date read operation to succeed. Failures can affect up until where the remaining healthy nodes is at least R.

a-deal

pragma solidity ^0.5.0;

import "./provableAPI_0.5.sol";
import "./SafeMath.sol";

/// @title A simulated coin flipper with rewards for winners!
/// @author Andrew Deal
/// @notice You can use this contract to win ETH if you guess heads or tails correctly!
contract ChainFlipper is usingProvable {

a-deal

Verifying my Blockstack ID is secured with the address 1F7rqBkEUnukZanjyTjGCKLEVMC38RX4F4 https://explorer.blockstack.org/address/1F7rqBkEUnukZanjyTjGCKLEVMC38RX4F4

a-deal

/*
Problem Description: 

  Given an array of integers AND/OR arbitrarily nested 
  arrays, return a single array of integers values only.

Input: <array>

Output: <array>