322. 零钱兑换

/**
 * @param {number[]} coins
 * @param {number} amount
 * @return {number}
 */
var coinChange = function (coins, amount) {
  const dp = new Array(amount + 1).fill(Infinity)
  dp[0] = 0
  for (let i = 0; i <= coins.length; i++) {
    for (let j = coins[i]; j <= amount; j++) {
      dp[j] = Math.min(dp[j], dp[j - coins[i]] + 1)
    }
  }
  return dp[amount] === Infinity ? -1 : dp[amount]
}