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花花酱 LeetCode 282. Expression Add Operators

题目大意:给你一个字符串,让你在数字之间加上+,-,*使得等式的值等于target。让你输出所有满足条件的表达式。

Given a string that contains only digits 0-9 and a target value, return all possibilities to add binary operators (not unary) +-, or * between the digits so they evaluate to the target value.

Examples:

Slides:

 

Solution 1: DFS

Time complexity: O(4^n)

Space complexity: O(n^2) -> O(n)

C++

C++ / SC O(n)

Java

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