Go: package main

import (
	. "fmt"
    "math"
)

// func init() { Println("----------------------------------------") }

func main() {
    const L_MAX = 1003

	var q int
	Scanf("%d", &q)
	X := make([]string, 0, 150)
	Y := make([]string, 0, 150)
	for i := 0; i < 2 * q; i++ {
	    var tmp string
	    Scanf("%s", &tmp)

	    if i % 2 == 0 {
	        X = append(X, tmp)
	    } else {
	        Y = append(Y, tmp)
	    }
	}

    for i := 0; i < q; i++ {
        dp := make([][]int, L_MAX)
        for k, _ := range dp {
            dp[k] = make([]int, L_MAX)
        }

        x, y := X[i], Y[i]

        // init
        isXFound := false
        for c := 0; c < len(x); c++ {
            if isXFound || y[0] == x[c] {
                dp[0][c] = 1
                isXFound = true
            }
        }
        isYFound := false
        for r := 0; r < len(y); r++ {
            if isYFound || x[0] == y[r] {
                dp[r][0] = 1
                isYFound = true
            }
        }

        for r := 1; r < len(y); r++ {
            for c := 1; c < len(x); c++ {
                // dp[r][c]
                if x[c] == y[r] {
                    dp[r][c] = int(math.Max(float64(dp[r - 1][c - 1] + 1), float64(dp[r][c])))
                }

                dp[r][c] = int(math.Max(float64(dp[r][c]), math.Max(float64(dp[r - 1][c]), float64(dp[r][c - 1]))))
            }
        }
        Println(dp[len(y) - 1][len(x) - 1])

        // LCSも求めておく
        // ans := ""
        // r, c := len(y) - 1, len(x) - 1
        // for r >= 0 && c >= 0 {
        //     if y[r] == x[c] {
        //         ans = string(x[c]) + ans
        //         r--
        //         c--
        //     } else {
        //         if dp[r - 1][c] > dp[r][c - 1] {
        //             r--
        //         } else {
        //             c--
        //         }
        //     }
        // }
        // Println(ans)
    }
}

Python: 
def LCS(x, y):
    dp = {}
    for i in range(len(x)+1):
        dp[i] = {0: i}
    for j in range(len(y)+1):
        dp[0][j] = j
    
    for i in range(1, len(x)+1):
        for j in range(1, len(y)+1):
            d = 0 if x[i-1] == y[j-1] else 1
            dp[i][j] = min(dp[i-1][j] + 1, dp[i][j-1] + 1, dp[i-1][j-1] + d)
    
    longer = max(len(x), len(y))
    return (longer - dp[len(x)][len(y)])

q = int(raw_input())
for i in range(q):
    X = raw_input()
    Y = raw_input()
    print(LCS(X, Y))

Python: def findlcs(x, y):
    dp = [0]*(len(y)+1)

    for i in range(len(x)):
        tmp = dp[:]
        for j in range(len(y)):
            if x[i] == y[j]:
                dp[j+1] = tmp[j] + 1
            else:
                dp[j+1] = max(dp[j+1], dp[j])

    return dp[len(y)]


q = int(input())
for k in range(q):
    X = input()
    Y = input()
    print(findlcs(X, Y))

Python: q = int(input())


for __ in range (q):

    S1 = input()
    S2 = input()
    dp = [[0 for i in range(len(S2)+1+10)] for j in range(len(S1)+1+10)]


    for i in range (len(S1)):
        for j in range (len(S2)):
            if S1[i] == S2[j]:
                dp[i+1][j+1] = max(dp[i+1][j]+1,dp[i+1][j]+1)
            else:
                dp[i+1][j+1] = max(dp[i+1][j],dp[i][j+1])

    print(dp[len(S1)][len(S2)])

Python: def solveZ(X, Y, Z, x, y):
	if x < len(X) and y < len(Y):
		ans = [solveZ(X, Y, Z, x, y+1)]
		Z.append(Y[y])
		for j in range(x, len(X)):
			if Y[y] == X[j]:
				ans.append(solveZ(X, Y, Z, j+1, y+1))
		return max(ans)
	else:
		return len(Z)

q = int(input())
for i in range(q):
	X = input()
	Y = input()
	ans[i] = solveZ(X, Y, [], 0, 0)

for i in range(q):
	print(ans[i])

Python: def main():
    n = int(input())
    for i in range(n):
        a = input()
        b = input()
        na=len(a)
        nb=len(b)
        array = [[0]*nb for i in range(na)]
        #array = [[0 for i in range(nb)] for j in range(na)]
        for i in range(na):
            for j in range(nb):
                c = 0
                if i==0:
                    if a[i]==b[j]:
                        array[i][j]=1
                elif j==0:
                    if a[i]==b[j]:
                        array[i][j]=1
                else:
                    if a[i] == b[j]:
                        c = 1
                        array[i][j] = max(
                            array[i-1][j],
                            array[i][j-1],
                            array[i-1][j-1]+c)
        print(array[na-1][nb-1])
if __name__ == "__main__":
    main()

Python: def lcs(X,Y):
  hist = [0]

  for y in Y:
    for i in range(len(hist)-1, -1, -1):
      found = X.find(y, hist[i])+1
      if found:
        if i+1 >= len(hist):
          hist.append(found)
        else:
          hist[i+1] = min(hist[i+1], found)
  return len(hist)-1


n = int(input())
for _ in range(n):
  a = input()
  b = input()
  print(lcs(a,b))

Python: from collections import defaultdict

def longest_common_subsequence(X, Y):
    len_X = len(X)
    len_Y = len(Y)
    c = [0] * len_Y

    for i in range(1, len_X):
        c_ = c[:]

        for j in range(1, len_Y):

            if X[i] == Y[j]:
                c[j] = c_[j - 1] + 1
            elif c_[j] < c[j - 1]:
                c[j] = c[j - 1]
    
    return c[-1]

def Main():
    Q = int(input())

    for q in range(Q):
        X = " " + input()
        Y = " " + input()
        print(longest_common_subsequence(X, Y))

Main()

Python: def LCS(str1,str2):
    A = [[0 for _ in range(len(str2)+1)]for __ in range(len(str1)+1)]
    for i in range(len(str1)):
        for j in range(len(str2)):
            if(str1[i]==str2[j]):
                A[i+1][j+1] = A[i][j]+1
            elif(A[i+1][j] > A[i][j+1]):
                A[i+1][j+1] = A[i+1][j]
            else:
                A[i+1][j+1] = A[i][j+1]
    return A[-1]


m = int(input())
for i in range(m):
    str1 = input()
    str2 = input()
    print(LCS(str1,str2))

Python: import numpy as np
import time
def f(i,j):
    if i == 0 or j == 0:
        if s1[i] == s2[j]:
            x[i][j] = 1
        else:
            if i == 0:
                x[i][j] = x[i][j-1]
            else:
                x[i][j] = x[i-1][j]
    elif s1[i] == s2[j]:
        x[i][j] = max(x[i-1][j-1]+1,x[i][j-1],x[i-1][j])
    else:
        x[i][j] = max(x[i-1][j-1],x[i][j-1],x[i-1][j])

t1 = time.time()
n = int(input())
for i in range(n):
    s1 = input()
    s2 = input()
    x = np.zeros((len(s1),len(s2)))
    for j in range(len(s1)):
        for k in range(len(s2)):
            f(j,k)
            
    print(int(x[len(s1)-1][len(s2)-1]))
t2 = time.time()

Python: for _ in[0]*int(input()):
 X,z=input(),[]
 for y in input():
  s=i=0
  for k in z:
   t=X.find(y,s)+1
   if t<1:break
   if t<k:z[i]=t
   s=k;i+=1
  else:
   t=X.find(y,s)+1
   if t:z+=[t]
 print(len(z))

Python: import sys
sys.setrecursionlimit(10000)
def lcs(X, Y):
    i = len(X)
    j = len(Y)
    if not i or not j:
        return 0
    if memo[i][j] >= 0:
        return memo[i][j]
    if X[-1] == Y[-1]:
        return 1 + lcs(X[:-1], Y[:-1])
    else:
        memo[i][j] = max(lcs(X[:-1], Y), lcs(X, Y[:-1]))
        return memo[i][j]

q = int(input())
for i in range(q):
    X = input()
    Y = input()
    memo = [[-1 for j in range(len(Y) + 1)] for i in range(len(X) + 1)]
    print(lcs(X, Y))

Python: n = int(input())

for k in range(n):
    a = input()
    b = input()
    len_a, len_b = len(a), len(b)
    table = [[0] * (len_b +1) for i in range(len_a + 1)]
    
    for i in range(len_a):
        for j in range(len_b):
            if a[i] == b[j]:
                table[i+1][j+1] = table[i][j] + 1
            else:
                table[i+1][j+1] = max(table[i][j+1],table[i+1][j])
    print(table[len_a][len_b])