54 lines
952 B
Markdown
54 lines
952 B
Markdown
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## 题目一
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1,3,5,7
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2,4,6,13
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3,9,14,14
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右上,左下.
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二分,并记录小于等于某个值的个数和最接近的数
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## 题目四 StingST
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给定两个字符串S和T
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返回S的所有子序列中
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有多少个子序列的字面值等于T
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[1,1,2,2] [1,2]
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样本对应模型 ,结尾位置是否使用
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S T
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自序列 前缀串
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dp[i][j]:s只拿前i个字符串做子序列,有多少个子序列,字面值等于T的前j个字符的前缀串
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## 题目五
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给定一个字符串Str
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返回Str的所有子序列中有多少不同的字面值
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https://leetcode.com/problems/distinct-subsequences-ii/
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1,2,3,1
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第0个all为{""} 1
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第1个all为{"",1}
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第2个all为当前值加上上一个all {"",1,2,12}
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第3个all为当前值加上上一个all {"",1,2,12,3,13,23,123}
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如果出现相同值当前值减去上次以相同符号开始的集合的非空总数
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{"",1,2,12,3,13,23,123, 1,11,21,121,31,131,231,1231}-{1}
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mynachure
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