{ "data": { "question": { "questionId": "2008", "questionFrontendId": "1896", "categoryTitle": "Algorithms", "boundTopicId": 820494, "title": "Minimum Cost to Change the Final Value of Expression", "titleSlug": "minimum-cost-to-change-the-final-value-of-expression", "content": "
You are given a valid boolean expression as a string expression
consisting of the characters '1'
,'0'
,'&'
(bitwise AND operator),'|'
(bitwise OR operator),'('
, and ')'
.
"()1|1"
and "(1)&()"
are not valid while "1"
, "(((1))|(0))"
, and "1|(0&(1))"
are valid expressions.Return the minimum cost to change the final value of the expression.
\n\nexpression = "1|1|(0&0)&1"
, its value is 1|1|(0&0)&1 = 1|1|0&1 = 1|0&1 = 1&1 = 1
. We want to apply operations so that the new expression evaluates to 0
.The cost of changing the final value of an expression is the number of operations performed on the expression. The types of operations are described as follows:
\n\n'1'
into a '0'
.'0'
into a '1'
.'&'
into a '|'
.'|'
into a '&'
.Note: '&'
does not take precedence over '|'
in the order of calculation. Evaluate parentheses first, then in left-to-right order.
\n
Example 1:
\n\n\nInput: expression = "1&(0|1)"\nOutput: 1\nExplanation: We can turn "1&(0|1)" into "1&(0&1)" by changing the '|' to a '&' using 1 operation.\nThe new expression evaluates to 0. \n\n\n
Example 2:
\n\n\nInput: expression = "(0&0)&(0&0&0)"\nOutput: 3\nExplanation: We can turn "(0&0)&(0&0&0)" into "(0|1)|(0&0&0)" using 3 operations.\nThe new expression evaluates to 1.\n\n\n
Example 3:
\n\n\nInput: expression = "(0|(1|0&1))"\nOutput: 1\nExplanation: We can turn "(0|(1|0&1))" into "(0|(0|0&1))" using 1 operation.\nThe new expression evaluates to 0.\n\n
\n
Constraints:
\n\n1 <= expression.length <= 105
expression
only contains '1'
,'0'
,'&'
,'|'
,'('
, and ')'
"()"
is not a substring of expression
).给你一个 有效的 布尔表达式,用字符串 expression
表示。这个字符串包含字符 '1'
,'0'
,'&'
(按位 与 运算),'|'
(按位 或 运算),'('
和 ')'
。
\"()1|1\"
和 \"(1)&()\"
不是有效 布尔表达式。而 \"1\"
, \"(((1))|(0))\"
和 \"1|(0&(1))\"
是 有效 布尔表达式。你的目标是将布尔表达式的 值 反转 (也就是将 0
变为 1
,或者将 1
变为 0
),请你返回达成目标需要的 最少操作 次数。
expression = \"1|1|(0&0)&1\"
,它的 值 为 1|1|(0&0)&1 = 1|1|0&1 = 1|0&1 = 1&1 = 1
。我们想要执行操作将 新的 表达式的值变成 0
。可执行的 操作 如下:
\n\n'1'
变成一个 '0'
。'0'
变成一个 '1'
。'&'
变成一个 '|'
。'|'
变成一个 '&'
。注意:'&'
的 运算优先级 与 '|'
相同 。计算表达式时,括号优先级 最高 ,然后按照 从左到右 的顺序运算。
\n\n
示例 1:
\n\n输入:expression = \"1&(0|1)\"\n输出:1\n解释:我们可以将 \"1&(0|1)\" 变成 \"1&(0&1)\" ,执行的操作为将一个 '|' 变成一个 '&' ,执行了 1 次操作。\n新表达式的值为 0 。\n\n\n
示例 2:
\n\n输入:expression = \"(0&0)&(0&0&0)\"\n输出:3\n解释:我们可以将 \"(0&0)&(0&0&0)\" 变成 \"(0|1)|(0&0&0)\" ,执行了 3 次操作。\n新表达式的值为 1 。\n\n\n
示例 3:
\n\n输入:expression = \"(0|(1|0&1))\"\n输出:1\n解释:我们可以将 \"(0|(1|0&1))\" 变成 \"(0|(0|0&1))\" ,执行了 1 次操作。\n新表达式的值为 0 。\n\n
\n\n
提示:
\n\n1 <= expression.length <= 105
expression
只包含 '1'
,'0'
,'&'
,'|'
,'('
和 ')'
\"()\"
不是 expression
的子字符串)。\\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, 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