Crawler Log Folder — Stack Depth Counter

# Python
def minOperations(logs):
    depth = 0
    for log in logs:
        if log == '../': depth = max(0, depth-1)
        elif log != './': depth += 1
    return depth

// Java
public int minOperations(String[] logs) {
    int depth = 0;
    for (String log : logs) {
        if (log.equals("../")) depth = Math.max(0, depth-1);
        else if (!log.equals("./")) depth++;
    }
    return depth;
}