Given a string num that contains only digits and an integer target, return all possibilities to insert the binary operators '+', '-', and/or '*' between the digits of num so that the resultant expression evaluates to the target value.
Note that operands in the returned expressions should not contain leading zeros.
\n\nNote that a number can contain multiple digits.
\n\n\n
Example 1:
\n\n\nInput: num = "123", target = 6\nOutput: ["1*2*3","1+2+3"]\nExplanation: Both "1*2*3" and "1+2+3" evaluate to 6.\n\n\n
Example 2:
\n\n\nInput: num = "232", target = 8\nOutput: ["2*3+2","2+3*2"]\nExplanation: Both "2*3+2" and "2+3*2" evaluate to 8.\n\n\n
Example 3:
\n\n\nInput: num = "3456237490", target = 9191\nOutput: []\nExplanation: There are no expressions that can be created from "3456237490" to evaluate to 9191.\n\n\n
\n
Constraints:
\n\n1 <= num.length <= 10num consists of only digits.-231 <= target <= 231 - 1给定一个仅包含数字 0-9 的字符串 num 和一个目标值整数 target ，在 num 的数字之间添加 二元 运算符（不是一元）+、- 或 * ，返回 所有 能够得到 target 的表达式。
注意，返回表达式中的操作数 不应该 包含前导零。
\n\n注意，一个数字可以包含多个数位。
\n\n\n\n
示例 1:
\n\n\n输入: num = \"123\", target = 6\n输出: [\"1+2+3\", \"1*2*3\"] \n解释: “1*2*3” 和 “1+2+3” 的值都是6。\n\n\n示例 2:
\n\n\n输入: num = \"232\", target = 8\n输出: [\"2*3+2\", \"2+3*2\"]\n解释: “2*3+2” 和 “2+3*2” 的值都是8。\n\n\n示例 3:
\n\n\n输入: num = \"3456237490\", target = 9191\n输出: []\n解释: 表达式 “3456237490” 无法得到 9191 。\n\n\n\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5df2\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\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>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "\"123\"\n6\n\"232\"\n8\n\"3456237490\"\n9191",
"__typename": "QuestionNode"
}
}
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