Testing Test Test Test

class Solution:
    def longestCommonSubsequence(self, text1: str, text2: str) -> int:
        
        # edge cases

        # both texts are just length of 1:
        if len(text1) == 1 and len(text2) == 1:
            return int(text1 == text2)
        
        # only one row:
        if len(text2) == 1 and len(text1) > 1:
            return int(text2 in text1)
        
        # only one col:
        if len(text1) == 1 and len(text2) > 1:
            return int(text1 in text2)
        
        rows = len(text2)
        cols = len(text1)

        # we use bottom up 2D DP
        # reaching here means it is at least 2x2
        dp = [
            [0 for _ in range(cols)] for _ in range(rows)
        ]

        # seed the top left tile
        dp[0][0] = 1 if text1[0] == text2[0] else 0

        # we seed the first row and first col
        for col in range(1, cols):
            dp[0][col] = dp[0][col - 1] if text1[col] != text2[0] else 1

        
        for row in range(1, rows):
            dp[row][0] = dp[row - 1][0] if text1[0] != text2[row] else 1
        

        # for the inner triangle, we use the following
        # dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]) if text1[i] != text2[j] 
        #               else max(dp[i - 1][j], dp[i][j - 1]) + 1

        for row in range(1, rows):
            for col in range(1, cols):
                dp[row][col] = dp[row - 1][col - 1] + 1 if text1[col] == text2[row] else max(dp[row - 1][col], dp[row][col - 1])

        # return the bottom right tile
        return dp[rows - 1][cols - 1]

        # space and time complexity: both O(N * M)

        # CAN OPTIMIZE TO GET SPACE COMPLEXITY OF O(MIN(N, M))

// Here we have the syscalls
// Unsafe !!!
#[link(name = "c")]
extern "C" {
    pub fn epoll_create(size: i32) -> i32;
    pub fn close(fd: i32) -> i32;
    pub fn epoll_ctl(epfd: i32, op: i32, fd: i32, event: *mut Event) -> i32;
    pub fn epoll_wait(epfd: i32, events: *mut Event, maxevents: i32, timeout: i32) -> i32;
}

// Avoid padding by using repr(packed)
// Data struct is different in Rust compared to C
#[derive(Debug)]
#[repr(C)]
#[cfg_attr(target_arch = "x86_64", repr(packed))]
pub struct Event {
    pub(crate) events: u32,
    // Using `Token` a.k.a `epoll_data` to track which socket generated the event
    pub(crate) epoll_data: usize,
}

impl Event {
    pub fn token(&self) -> usize {
        self.epoll_data
    }
}