{ "data": { "question": { "questionId": "3774", "questionFrontendId": "3463", "categoryTitle": "Algorithms", "boundTopicId": 3082541, "title": "Check If Digits Are Equal in String After Operations II", "titleSlug": "check-if-digits-are-equal-in-string-after-operations-ii", "content": "
You are given a string s
consisting of digits. Perform the following operation repeatedly until the string has exactly two digits:
s
, starting from the first digit, calculate a new digit as the sum of the two digits modulo 10.s
with the sequence of newly calculated digits, maintaining the order in which they are computed.Return true
if the final two digits in s
are the same; otherwise, return false
.
\n
Example 1:
\n\nInput: s = "3902"
\n\nOutput: true
\n\nExplanation:
\n\ns = "3902"
(s[0] + s[1]) % 10 = (3 + 9) % 10 = 2
(s[1] + s[2]) % 10 = (9 + 0) % 10 = 9
(s[2] + s[3]) % 10 = (0 + 2) % 10 = 2
s
becomes "292"
(s[0] + s[1]) % 10 = (2 + 9) % 10 = 1
(s[1] + s[2]) % 10 = (9 + 2) % 10 = 1
s
becomes "11"
"11"
are the same, the output is true
.Example 2:
\n\nInput: s = "34789"
\n\nOutput: false
\n\nExplanation:
\n\ns = "34789"
.s = "7157"
.s = "862"
.s = "48"
.'4' != '8'
, the output is false
.\n
Constraints:
\n\n3 <= s.length <= 105
s
consists of only digits.给你一个由数字组成的字符串 s
。重复执行以下操作,直到字符串恰好包含 两个 数字:
s
中的每一对连续数字,计算这两个数字的和 模 10。s
的每一个字符,并保持原本的顺序。如果 s
最后剩下的两个数字相同,则返回 true
。否则,返回 false
。
\n\n
示例 1:
\n\n输入: s = \"3902\"
\n\n输出: true
\n\n解释:
\n\ns = \"3902\"
(s[0] + s[1]) % 10 = (3 + 9) % 10 = 2
(s[1] + s[2]) % 10 = (9 + 0) % 10 = 9
(s[2] + s[3]) % 10 = (0 + 2) % 10 = 2
s
变为 \"292\"
(s[0] + s[1]) % 10 = (2 + 9) % 10 = 1
(s[1] + s[2]) % 10 = (9 + 2) % 10 = 1
s
变为 \"11\"
\"11\"
中的数字相同,输出为 true
。示例 2:
\n\n输入: s = \"34789\"
\n\n输出: false
\n\n解释:
\n\ns = \"34789\"
。s = \"7157\"
。s = \"862\"
。s = \"48\"
。'4' != '8'
,输出为 false
。\n
提示:
\n\n3 <= s.length <= 105
s
仅由数字组成。nCr
and use Pascal's triangle values here?",
"nCr mod 10
can be uniquely determined from nCr mod 2
and nCr mod 5
.",
"Use Lucas's theorem."
],
"solution": null,
"status": null,
"sampleTestCase": "\"3902\"",
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