Go: package main

import (
	"fmt"
	"os"
	"strconv"
	"bufio"
	"strings"
	"sort"
)

// define
var (
	sc = bufio.NewScanner(os.Stdin)
)

func bordersInt(in_map [][]int, invalid int) [][]int{
	H, W := len(in_map), len(in_map[0])
	out_map := make([][]int, H+2)
	for h:=0; h<H+2; h++ {
		out_map[h] = make([]int, W+2)
		for w:=0; w<W+2; w++ {
			out_map[h][w] = invalid
		}
	}
	for h:=0; h<H; h++{
		for w:=0; w<W; w++{
			out_map[h+1][w+1] = in_map[h][w] 
		}
	}
	return out_map
}

func bordersString(in_map [][]string, invalid string) [][]string{
	H, W := len(in_map), len(in_map[0])
	out_map := make([][]string, H+2)
	for h:=0; h<H+2; h++ {
		out_map[h] = make([]string, W+2)
		for w:=0; w<W+2; w++ {
			out_map[h][w] = invalid
		}
	}
	for h:=0; h<H; h++{
		for w:=0; w<W; w++{
			out_map[h+1][w+1] = in_map[h][w] 
		}
	}
	return out_map
}

func scanIntLine(len int) []int{
	arr := make([]int, len)
	for i:=0; i<len; i++{
		sc.Scan()
		tmp, err := strconv.Atoi(sc.Text())
		if err == nil{
			arr[i] = tmp
		}
	}
	return arr
}

func scanStringLine(len int) []string{
	arr := make([]string, len)
	for i:=0; i<len; i++{
		sc.Scan()
		arr[i] = sc.Text()
	}
	return arr
}

func scanIntSplit(len int) []int{
	arr := make([]int, len)
	sc.Scan()
	for i, v := range strings.Split(sc.Text(), " "){
		tmp, err := strconv.Atoi(v)
		if err == nil{
			arr[i] = tmp
		}
	}
	return arr
}

func maxInt(args... int) int{
	sort.Ints(args)
	return args[len(args)-1]
}

func main(){
	buf := make([]byte, 0)
    sc.Buffer(buf, 1000000009)
	var n int 
	fmt.Scan(&n)
	dp := make([][]int, 1003)
	for i:=0; i<1003; i++ {
		dp[i] = make([]int, 1003)
	}
	input_lines := scanStringLine(2*n)
	for i:=0; i<n; i++ {
		S, T := input_lines[2*i], input_lines[2*i+1]
		lenS, lenT := len(S), len(T)
		for i:=1; i<lenS+1; i++ {
			for j:=1; j<lenT+1; j++ {
				if S[i-1] == T[j-1] {
					dp[i][j] = maxInt(dp[i-1][j-1]+1, dp[i-1][j], dp[i][j-1])
				} else {
					dp[i][j] = maxInt(dp[i-1][j], dp[i][j-1])
				}
			}
		}
		fmt.Println(dp[lenS][lenT])
	}
}

Python: q = int(input())
for _ in [0]*q:
    s1, s2 = input(), input()
    l1, l2 = len(s1), len(s2)

    dp = [[0]*(l2+1) for _ in [0]*(l1+1)]
    for i, c1 in enumerate(s1, start=1):
        for j, c2 in enumerate(s2, start=1):
            dp[i][j] = max(dp[i][j], dp[i-1][j], dp[i][j-1], dp[i-1][j-1]+(c1==c2))

    print(dp[-1][-1])

Python: def lcs(s1, s2):
    n, m = len(s1), len(s2)
    dp = [[0] * (m+1) for _ in range(n+1)]

    for i in range(1, n+1):
        for j in range(1, m+1):
            if s1[i-1] == s2[j-1]:
                dp[i][j] = dp[i-1][j-1] + 1
            else:
                dp[i][j] = max(dp[i-1][j], dp[i][j-1])

    return dp[n][m]

def solve():
    N = int(input())
    for _ in range(N):
        a = input()
        b = input()
        print(lcs(a, b))

if __name__ == '__main__':
    solve()

Python: def calc(x,y):
    n = len(x)
    m = len(y)
    dp1 = [0]*(m+1)
    for i in range(n):
        s = x[i]
        dp2 = dp1[:]
        for j in range(m):
            if s == y[j]:
                dp1[j+1] = dp2[j]+1
            elif dp1[j+1] < dp1[j]:
                dp1[j+1] = dp1[j]
    return dp1[-1]

q = int(input())
for i in range(q):
    x = input()
    y = input()
    print(calc(x,y))

Python: """
problem statment url: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_C
"""


def lcs():
	s1 = raw_input()
	s2 = raw_input()
	la, lb = len(s1), len(s2)
	dp1 = [0 for _ in range(lb + 1)]

	for i in range(la):
		dp2 = dp1 + []
		for j in range(lb):
			if s1[i] == s2[j]:
				dp1[j + 1] = dp2[j] + 1
			elif dp1[j + 1] < dp1[j]:
				dp1[j + 1] = dp1[j]

	return dp1[-1]

if __name__ == '__main__':
	tc = int(raw_input())
	for _ in range(tc):
		print(lcs())

Python: import sys


def lcs(X, Y):
    len_x = len(X)
    dp = [0] * (len_x + 1)

    for y in Y:
        _dp = dp[:]
        for j, x in enumerate(X):
            if x == y:
                dp[j + 1] = _dp[j] + 1
    
            elif _dp[j + 1] < dp[j]:
                dp[j + 1] = dp[j]

    return dp[len_x]


n = int(sys.stdin.readline())
for i in range(n):
    X = sys.stdin.readline().rstrip()
    Y = sys.stdin.readline().rstrip()
    print(lcs(X, Y))

Python: def lcs(m,n):
    N = len(n)
    dp = [0]*(N+1)
    for x in m:
        cp_dp = dp[:]
        for i ,y in enumerate(n):
            if x == y :
                dp[i+1] = cp_dp[i] +1 
            else:
                if dp[i+1] < dp[i]:
                    dp[i+1] = dp[i]
    return dp[N]

a = int(input())

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

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: """
problem statment url: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_C
"""

from __future__ import division
from sys import stdin, maxint

def lcs(s1, s2):
	dp = [[0 for _ in range(len(s2) + 1)] for _ in range(len(s1) + 1)]

	for i in xrange(1, len(s1) + 1):
		for j in xrange(1, len(s2) + 1):
			if s1[i - 1] == s2[j - 1]:
				dp[i][j] = dp[i - 1][j - 1] + 1
			else:
				dp[i][j] = max(dp[i - 1][j], dp[i][j - 1])

	return dp[len(s1)][len(s2)]

if __name__ == '__main__':
	tc = int(stdin.readline())
	for _ in range(tc):
		sa = stdin.readline().strip()
		sb = stdin.readline().strip()
		print(lcs(sa, sb))

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):
        a_i = a[i]
        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])

Python: n=int(input())
ans=[]
for k in range(n):
    s1=input()
    s2=input()
    dp=[[0 for i in range(len(s2)+1)] for j in range(len(s1)+1)]
    for i in range(1,len(s1)+1):
        for j in range(1,len(s2)+1):
            if s1[i-1]==s2[j-1]:
                dp[i][j]=dp[i-1][j-1]+1
            else:
                dp[i][j]=max(dp[i-1][j],dp[i][j-1])


    ans.append(dp[len(s1+1)][len(s2+1)])
for a in ans:
    print(a)

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

Python: from sys import stdin
def lcs(x, y):
    m = len(x)
    n = len(y)
    c = [[0]*(m + 2) for a in range(n + 2)]
    for i in range(1, m + 1):
        for j in range(1, n + 1):
            if x[i-1] == y[j-1]:
                c[i][j] = (c[i - 1][j - 1]) + 1
            else:
                c[i][j] = max(c[i - 1][j], c[i][j - 1])
    return max(max(c))

n = int(input().rstrip())
strs = stdin.readlines()
ret = []
for i in range(n):
    # s1 = strs[i*2].rstrip()
    # s2 = strs[i*2+1].rstrip()
    ret.append(lcs(strs[i*2].rstrip(), strs[i*2+1].rstrip()))
print(*ret, sep="\n")

Python: def lcs(X, Y):
    row, colums = len(X) + 1, len(Y) + 1
    lcs_list = [[0 for y in range(colums)] for x in range(row)]
    for i in range(row):
        for j in range(colums):
            if i == 0 or j == 0:
                lcs_list[i][j] = 0
            elif X[i-1] == Y[j-1]:
                lcs_list[i][j] = lcs_list[i-1][j-1] + 1
            else:
                lcs_list[i][j] = max(lcs_list[i][j-1], lcs_list[i-1][j])
    return lcs_list[-1][-1]

import sys
n = int(input())
input_lines = sys.stdin.readlines()
for i in range(n):
    X = list(input_lines[2*i].rstrip())
    Y = list(input_lines[2*i+1].rstrip())
    print(lcs(X,Y))