GRAPH COLORING +========+ Time: 1 hour - 2 hours Difficulty: Hard Languages: Any +========+ Given an undirected graph represented by an adjacency matrix, implement a function that finds the smallest number of colors that can be used to color the graph such that no two adjacent vertices have the same color, using the Welsh-Powell algorithm +========+ Please answer to this message with your solution 🙂
GRAPH COLORING +========+ Time: 1 hour - 2 hours Difficulty: Hard Languages: Any +========+ Given an undirected graph represented by an adjacency matrix, implement a function that finds the smallest number of colors that can be used to color the graph such that no two adjacent vertices have the same color, using the Welsh-Powell algorithm +========+ Please answer to this message with your solution 🙂
BY Programming Challenges
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Bitcoin is a decentralized digital currency that you can buy, sell and exchange directly, without an intermediary like a bank. Bitcoin’s creator, Satoshi Nakamoto, originally described the need for “an electronic payment system based on cryptographic proof instead of trust.” Each and every Bitcoin transaction that’s ever been made exists on a public ledger accessible to everyone, making transactions hard to reverse and difficult to fake. That’s by design: Core to their decentralized nature, Bitcoins aren’t backed by the government or any issuing institution, and there’s nothing to guarantee their value besides the proof baked in the heart of the system. “The reason why it’s worth money is simply because we, as people, decided it has value—same as gold,” says Anton Mozgovoy, co-founder & CEO of digital financial service company Holyheld.
How to Buy Bitcoin?
Most people buy Bitcoin via exchanges, such as Coinbase. Exchanges allow you to buy, sell and hold cryptocurrency, and setting up an account is similar to opening a brokerage account—you’ll need to verify your identity and provide some kind of funding source, such as a bank account or debit card. Major exchanges include Coinbase, Kraken, and Gemini. You can also buy Bitcoin at a broker like Robinhood. Regardless of where you buy your Bitcoin, you’ll need a digital wallet in which to store it. This might be what’s called a hot wallet or a cold wallet. A hot wallet (also called an online wallet) is stored by an exchange or a provider in the cloud. Providers of online wallets include Exodus, Electrum and Mycelium. A cold wallet (or mobile wallet) is an offline device used to store Bitcoin and is not connected to the Internet. Some mobile wallet options include Trezor and Ledger.
