{ "data": { "question": { "questionId": "3046", "questionFrontendId": "2844", "categoryTitle": "Algorithms", "boundTopicId": 2423684, "title": "Minimum Operations to Make a Special Number", "titleSlug": "minimum-operations-to-make-a-special-number", "content": "
You are given a 0-indexed string num
representing a non-negative integer.
In one operation, you can pick any digit of num
and delete it. Note that if you delete all the digits of num
, num
becomes 0
.
Return the minimum number of operations required to make num
special.
An integer x
is considered special if it is divisible by 25
.
\n
Example 1:
\n\n\nInput: num = "2245047"\nOutput: 2\nExplanation: Delete digits num[5] and num[6]. The resulting number is "22450" which is special since it is divisible by 25.\nIt can be shown that 2 is the minimum number of operations required to get a special number.\n\n
Example 2:
\n\n\nInput: num = "2908305"\nOutput: 3\nExplanation: Delete digits num[3], num[4], and num[6]. The resulting number is "2900" which is special since it is divisible by 25.\nIt can be shown that 3 is the minimum number of operations required to get a special number.\n\n
Example 3:
\n\n\nInput: num = "10"\nOutput: 1\nExplanation: Delete digit num[0]. The resulting number is "0" which is special since it is divisible by 25.\nIt can be shown that 1 is the minimum number of operations required to get a special number.\n\n\n\n
\n
Constraints:
\n\n1 <= num.length <= 100
num
only consists of digits '0'
through '9'
.num
does not contain any leading zeros.给你一个下标从 0 开始的字符串 num
,表示一个非负整数。
在一次操作中,您可以选择 num
的任意一位数字并将其删除。请注意,如果你删除 num
中的所有数字,则 num
变为 0
。
返回最少需要多少次操作可以使 num
变成特殊数字。
如果整数 x
能被 25
整除,则该整数 x
被认为是特殊数字。
\n\n
\n\n
示例 1:
\n\n\n输入:num = \"2245047\"\n输出:2\n解释:删除数字 num[5] 和 num[6] ,得到数字 \"22450\" ,可以被 25 整除。\n可以证明要使数字变成特殊数字,最少需要删除 2 位数字。\n\n
示例 2:
\n\n\n输入:num = \"2908305\"\n输出:3\n解释:删除 num[3]、num[4] 和 num[6] ,得到数字 \"2900\" ,可以被 25 整除。\n可以证明要使数字变成特殊数字,最少需要删除 3 位数字。\n\n
示例 3:
\n\n\n输入:num = \"10\"\n输出:1\n解释:删除 num[0] ,得到数字 \"0\" ,可以被 25 整除。\n可以证明要使数字变成特殊数字,最少需要删除 1 位数字。\n\n\n
\n\n
提示
\n\n1 <= num.length <= 100
num
仅由数字 '0'
到 '9'
组成num
不含任何前导零num
contains a single zero digit then the answer is at most n - 1
.",
"A number is divisible by 25
if its last two digits are 75
, 50
, 25
, or 00
.",
"Iterate over all possible pairs of indices i < j
such that num[i] * 10 + num[j]
is in [00,25,50,75]
. Then, set the answer to min(answer, n - i - 2)
."
],
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"status": null,
"sampleTestCase": "\"2245047\"",
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