You are given an integer array target and an integer n.
You have an empty stack with the two following operations:
\n\n"Push": pushes an integer to the top of the stack."Pop": removes the integer on the top of the stack.You also have a stream of the integers in the range [1, n].
Use the two stack operations to make the numbers in the stack (from the bottom to the top) equal to target. You should follow the following rules:
target, do not read new integers from the stream and do not do more operations on the stack.Return the stack operations needed to build target following the mentioned rules. If there are multiple valid answers, return any of them.
\n
Example 1:
\n\n\nInput: target = [1,3], n = 3\nOutput: ["Push","Push","Pop","Push"]\nExplanation: Initially the stack s is empty. The last element is the top of the stack.\nRead 1 from the stream and push it to the stack. s = [1].\nRead 2 from the stream and push it to the stack. s = [1,2].\nPop the integer on the top of the stack. s = [1].\nRead 3 from the stream and push it to the stack. s = [1,3].\n\n\n
Example 2:
\n\n\nInput: target = [1,2,3], n = 3\nOutput: ["Push","Push","Push"]\nExplanation: Initially the stack s is empty. The last element is the top of the stack.\nRead 1 from the stream and push it to the stack. s = [1].\nRead 2 from the stream and push it to the stack. s = [1,2].\nRead 3 from the stream and push it to the stack. s = [1,2,3].\n\n\n
Example 3:
\n\n\nInput: target = [1,2], n = 4\nOutput: ["Push","Push"]\nExplanation: Initially the stack s is empty. The last element is the top of the stack.\nRead 1 from the stream and push it to the stack. s = [1].\nRead 2 from the stream and push it to the stack. s = [1,2].\nSince the stack (from the bottom to the top) is equal to target, we stop the stack operations.\nThe answers that read integer 3 from the stream are not accepted.\n\n\n
\n
Constraints:
\n\n1 <= target.length <= 1001 <= n <= 1001 <= target[i] <= ntarget is strictly increasing.给你一个数组 target 和一个整数 n。
给你一个空栈和两种操作：
\n\n\"Push\"：将一个整数加到栈顶。\"Pop\"：从栈顶删除一个整数。同时给定一个范围 [1, n] 中的整数流。
使用两个栈操作使栈中的数字（从底部到顶部）等于 target。你应该遵循以下规则：
target，则不要从流中读取新的整数，也不要对栈进行更多操作。请返回遵循上述规则构建 target 所用的操作序列。如果存在多个合法答案，返回 任一 即可。
\n\n
示例 1：
\n\n\n输入：target = [1,3], n = 3\n输出：[\"Push\",\"Push\",\"Pop\",\"Push\"]\n解释：一开始栈为空。最后一个元素是栈顶。\n从流中读取 1 并推入数组。s = [1]。\n从流中读取 2 并推入数组。s = [1,2]。\n从栈顶删除整数。s = [1]。\n从流中读取 3 并推入数组。s = [1,3]。\n\n\n
示例 2：
\n\n\n输入：target = [1,2,3], n = 3\n输出：[\"Push\",\"Push\",\"Push\"]\n解释：一开始栈为空。最后一个元素是栈顶。\n从流中读取 1 并推入数组。s = [1]。\n从流中读取 2 并推入数组。s = [1,2]。\n从流中读取 3 并推入数组。s = [1,2,3]。\n\n\n
示例 3：
\n\n\n输入：target = [1,2], n = 4\n输出：[\"Push\",\"Push\"]\n解释：一开始栈为空。最后一个元素是栈顶。\n从流中读取 1 并推入数组。s = [1]。\n从流中读取 2 并推入数组。s = [1,2]。\n由于栈（从底部到顶部）等于 target，我们停止栈操作。\n从流中读取整数 3 的答案不被接受。\n\n\n
\n\n
提示：
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