leetgo/solutions/s1598_crawler_log_folder.go at main · egregors/leetgo · GitHub

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/*
	https://leetcode.com/problems/crawler-log-folder/

	The Leetcode file system keeps a log each time some user performs a change
		folder operation.

	The operations are described below:

		"../" : Move to the parent folder of the current folder. (If you are already
			in the main
	folder, remain in the same folder).
		"./" : Remain in the same folder.
		"x/" : Move to the child folder named x (This folder is guaranteed to always
			exist).

	You are given a list of strings logs where logs[i] is the operation performed
		by the user at
	the ith step.

	The file system starts in the main folder, then the operations in logs are
		performed.

	Return the minimum number of operations needed to go back to the main folder
		after the change
	folder operations.
*/

package solutions

type deep int

func (d *deep) inc() { *d++ }
func (d *deep) dec() {
	if *d > 0 {
		*d--
	}
}

func minOperations(logs []string) int {
	var d deep
	for _, step := range logs {
		switch step {
		case "../":
			d.dec()
		case "./":
			continue
		default:
			d.inc()
		}
	}

	return int(d)
}