Go: package main

/*
最長共通部分列
*/

import (
	"bufio"
	"bytes"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
)

func larger(l, r int) int {
	if l > r {
		return l
	}
	return r
}

var memo [1001][1001]int

func countLCS(x, y string) int {
	x = " " + x
	y = " " + y
	max := 0
	for xi := 1; xi < len(x); xi++ {
		for yi := 1; yi < len(y); yi++ {
			if x[xi] == y[yi] {
				memo[xi][yi] = memo[xi-1][yi-1] + 1
			} else {
				memo[xi][yi] = larger(memo[xi-1][yi], memo[xi][yi-1])
			}
			max = larger(max, memo[xi][yi])
		}
	}
	return max
}

func main() {
	scanner := makeScanner(1024)
	q := eGetInt(scanner)
	for i := 0; i < q; i++ {
		x := eGetLine(scanner)
		y := eGetLine(scanner)
		fmt.Println(countLCS(x, y))
	}
}

////////////////////////////////////////////////////////////////////////////////
// ライブラリ
////////////////////////////////////////////////////////////////////////////////
func makeScanner(maxByte int) *bufio.Scanner {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Buffer(make([]uint8, 0, 8192), maxByte)
	return scanner
}
func makeWordScanner() *bufio.Scanner {
	scanner := makeScanner(8192)
	scanner.Split(bufio.ScanWords)
	return scanner
}
func eGetLine(r *bufio.Scanner) string {
	if r.Scan() {
		return r.Text()
	}
	err := r.Err()
	if err != nil {
		log.Fatal(err)
	}
	// EOF
	return ""
}
func eGetInt(r *bufio.Scanner) int {
	line := eGetLine(r)
	return eAtoi(line)
}
func eGetFields(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Fields(line)
}
func eGetInts(r *bufio.Scanner) []int {
	fields := eGetFields(r)
	ints := make([]int, len(fields))
	for i := 0; i < len(ints); i++ {
		ints[i] = eAtoi(fields[i])
	}
	return ints
}
func eGetChars(r *bufio.Scanner) []string {
	line := eGetLine(r)
	return strings.Split(line, "")
}
func eAtoi(s string) int {
	n, err := strconv.Atoi(s)
	if err != nil {
		log.Fatal(err)
	}
	return n
}

type ints []int

func (s ints) String() string {
	var buf bytes.Buffer
	buf.WriteString("[")
	sep := ""
	for _, v := range s {
		buf.WriteString(fmt.Sprintf("%s%d", sep, v))
		sep = ", "
	}
	buf.WriteString("]")
	return buf.String()
}

func reverse(a ints) ints {
	r := make(ints, len(a))
	for i := 0; i < len(a); i++ {
		r[i] = a[len(a)-1-i]
	}
	return r
}
func max(a ints) (int, bool) {
	if len(a) == 0 {
		return 0, false
	}
	m := a[0]
	for _, e := range a {
		if e > m {
			m = e
		}
	}
	return m, true
}
func min(a []int) int {
	m := a[0]
	for _, v := range a {
		if v < m {
			m = v
		}
	}
	return m
}

func sum(a ints) int {
	if len(a) == 0 {
		return 0
	}
	sum := 0
	for _, e := range a {
		sum += e
	}
	return sum
}
func find(n int, a ints) int {
	for i, v := range a {
		if n == v {
			return i
		}
	}
	return -1
}

C++: #include <iostream>
#include <string>
#include <algorithm>
using namespace std;

static const int N = 1000;

int lcs(string x, string y) {
  int c[N + 1][N + 1];
  int m = x.size();
  int n = y.size();
  int maxl = 0;
  x = ' ' + x;
  y = ' ' + y;
  for ( int i = 1; i <= m; i++ ) c[i][0] = 0;
  for ( int j = 1; j <= n; j++ ) c[0][j] = 0;

  for ( int i = 1; i <= m; i++ ) {
    for ( int j = 1; j <= n; j++ ) {
      if ( x[i] == y[j] ) {
        c[i][j] = c[i - 1][j - 1] + 1;
      } else {
        c[i][j] = max(c[i - 1][j], c[i][j - 1]);
      }
      maxl = max(maxl, c[i][j]);
    }
  }

  return maxl;
}

int main() {
  string s1, s2;
  int q;
  cin >> q;

  for ( int i = 0; i < q; i++ ) {
    cin >> s1 >> s2;
    cout << lcs(s1, s2) << endl;
  }

  return 0;
}

C++: #include <iostream>
#include <algorithm>
#include <string>
using namespace std;
const int MAX=1001;
int lcs(string X,string Y) {
    int i=0,j=0,c[MAX][MAX],x=X.length(),y=Y.length();
    for(i=0;i<=x;i++)c[i][0]=0;
    for(i=0;i<=y;i++)c[0][i]=0;
    for(i=1;i<=x;i++) 
        for(j=1;j<=y;j++) 
            if(X[i-1]==Y[j-1])c[i][j]=c[i-1][j-1]+1; 
            else c[i][j]=max(c[i][j-1],c[i-1][j]);
    /*cout<<"???????????????????????????????????????"<<endl;
    for(i=1;i<=x;i++){
        for(j=1;j<=y;j++)cout<<c[i][j]<<" ";
        cout<<endl;
    }*/
    return c[x][y];
}
int main(){
    int n;cin>>n;
    string X,Y;
    while(n--){
        cin>>X>>Y;
        cout<<lcs(X,Y)<<endl;
    }
}

C++: #include <iostream>
#include <string>
#include <algorithm>
    using namespace std;
int lcs(string x,string y){
    int c[1010][1010];
    int m = x.size();
    int n = y.size();
    int maxl=0;
    x = ' '+x;
    y = ' '+y;
    for (int i=1; i<=m; i++) {
        c[i][0] = 0;
    }
    for(int j=1;j<=n;j++){
        c[0][j] = 0;
    }

    for(int i=1;i<=m;i++){
        for(int j=1;j<=n;j++){
            if(x[i]==y[j]){
                c[i][j] = c[i-1][j-1] + 1;
            }
            else c[i][j] = max(c[i-1][j], c[i][j-1]);
            maxl = max(maxl, c[i][j]);
        }
        
    }
    return maxl;
}
int main(){
    int q;
    string x;
    string y;
    scanf("%d",&q);
    for (int i=0; i<q; i++) {
        cin>>x>>y;
        cout<<lcs(x, y)<<endl;
    }
    return 0;
}

C++: #include <iostream>
#include <cstring>
#include <string>

using namespace std;


using ll = long long;


ll c[1001][1001];
void solve()
{
    string X, Y;
    cin >> X >> Y;

    memset(c, 0, sizeof(c));
    for (ll i = 0; i <= X.length(); i++)
        c[i][0] = 0;
    for (ll i = 0; i <= Y.length(); i++)
        c[0][i] = 0;

    for (ll i = 1; i <= X.length(); i++) {
        for (ll j = 1; j <= Y.length(); j++) {
            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]);
            }
        }
    }

    cout << c[X.length()][Y.length()] << endl;
}


int main()
{
    ll q;
    ll c[151][151];

    cin >> q;
    for (ll i = 0; i < q; i++) {
        solve();
    }
}

C++: #include <iostream>
#include <vector>
#include <array>
#include <string>

const int length = 1005;
int dp[length][length];

void LCS(std::string X, std::string Y)
{
  auto m = X.length();
  auto n = Y.length();


  for (int i=0; i<m; ++i)
    dp[i][0] = 0;
  for (int j=1; j<n; ++j)
    dp[0][j] = 0;

  for (int i=1; i<=m; ++i)
    {
      for (int j=1; j<=n; ++j)
        {
          if (X[i-1] == Y[j-1])
            dp[i][j] = dp[i-1][j-1] + 1;
          else
            {
              dp[i][j] = std::max(dp[i-1][j], dp[i][j-1]);
            }
        }
    }
}

int main ()
{
  int q;
  std::cin >> q;

  std::string X, Y;
  for (int i=0; i<q; ++i)
    {
      std::cin >> X >> Y;
      LCS(X, Y);
      std::cout << dp[X.length()][Y.length()] << std::endl;
    }
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cassert>
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define rep(i,n) FOR(i,0,n)
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define vint vector<int>
#define vdouble vector<double>
#define vstring vector<string>
using namespace std;

#include<map>
#include<set>
#include<queue>

typedef long long ll;
typedef unsigned long long ull;

const int MAX_N = 1000000;

int NN;
string s1, s2;
int dp[1001][1001];

int run(){
	int N1 = s1.length();
	int N2 = s2.length();
	
	rep(i1, N1+1)
	rep(i2, N2+1){
		if(i1 == 0 || i2 == 0) dp[i1][i2] = 0;
		else{
			if(s1[i1-1] == s2[i2-1]) dp[i1][i2] = dp[i1-1][i2-1] + 1;
			else dp[i1][i2] = max(dp[i1-1][i2], dp[i1][i2-2]);
		}
	}
	return dp[N1][N2];
}

int main() {
	cin >> NN;
	rep(i, NN){
		cin >> s1;
		cin >> s2;
		cout << run() << endl;
	}
}