问为什么我的代码不能通过测试用例从LeetCode 322硬币更改？

EN

def coinChange(coins, amount):
    """
    :type coins: List[int]
    :type amount: int
    :rtype: int
    """
    coins.sort()
    #init the dp list
    dp = [0]+[float('inf')]*amount
    for i in coins:
        for j in range(i,amount+1):
            dp[j] = min(dp[j],int(j/i)+dp[j%i])

    if dp[-1]==float('inf'):
        return -1
    else:
        return dp[-1]


#test cases1,the result should be 3    
coins = [1, 2, 5]
amount = 11
print(coinChange(coins,amount))
#test cases2,the result should be 20  
coins = [186,419,83,408]
amount = 6249
print(coinChange(coins,amount))