Go: package main

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

//Util
func nextStr() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func maxInt(a, b int) int {
	if a > b {
		return a
	} else {
		return b
	}
}

func minInt(a, b int) int {
	if a > b {
		return b
	} else {
		return a
	}
}

func absInt(a int) int {
	if a >= 0 {
		return a
	} else {
		return -a
	}
}

func absFloat64(a float64) float64 {
	if a >= 0 {
		return a
	} else {
		return -a
	}
}

func minFloat64(a, b float64) float64 {
	if a > b {
		return b
	} else {
		return a
	}
}

func str2Int(s string) int {
	n, _ := strconv.Atoi(s)
	return n
}

//Main
var sc = bufio.NewScanner(os.Stdin)
var q int
var X, Y string

func lcs(X, Y string) int {
	lenX := len(X)
	lenY := len(Y)
	dp := make([][]int, lenX+1)
	for i := 0; i < lenX+1; i++ {
		dp[i] = make([]int, lenY+1)
	}

	res := 0
	for i := 1; i < lenX+1; i++ {
		for j := 1; j < lenY+1; j++ {
			if X[i-1] == Y[j-1] {
				dp[i][j] = dp[i-1][j-1] + 1
			} else {
				dp[i][j] = maxInt(dp[i-1][j], dp[i][j-1])
			}
			//fmt.Println(dp)
			res = maxInt(res, dp[i][j])
		}

	}
	return res
}

func main() {
	sc.Split(bufio.ScanWords)
	q = nextInt()

	for i := 0; i < q; i++ {
		X = nextStr()
		Y = nextStr()

		fmt.Println(lcs(X, Y))
	}
}

C++: #include<iostream>
#include<string>
#include<algoritm>
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 n;
  cin>>n;
  for(int i = 0; i<n;i++){
    cin>>s1>>s2;
    cout<<lcs(s1,s2)<<endl;
  }
  return 0;
}

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;//??¨X[0]????????\?????????
	Y=' '+Y;//??¨Y[0]????????\?????????
	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 n;cin>>n;
	for(int i=0;i<n;i++)
	{
		cin>>s1>>s2;
		cout<<lcs(s1,s2)<<endl;
	}
}

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

using namespace std;

class Dataset{
private:
 string X;
 string Y;
public:
 Dataset(){
  string tmp = "";
  cin >> tmp; X = tmp; X = " " + X;
  cin >> tmp; Y = tmp; Y = " " + Y;
 };

 unsigned long getLongestCommonLength(){
  unsigned long Xsize = X.size();
  unsigned long Ysize = Y.size();
 
  vector< vector<unsigned long> > LC(Xsize, vector<unsigned long>(Ysize, 0));

  for(unsigned long X_i = 1; X_i < Xsize; ++X_i){
   for(unsigned long Y_i = 1; Y_i < Ysize; ++Y_i){
    unsigned long tmp = LC[X_i][Y_i-1];
    if(X[X_i] == Y[Y_i]) ++tmp;
    if(tmp < LC[X_i-1][Y_i]) tmp = LC[X_i-1][Y_i];
    LC[X_i][Y_i] = tmp;
   }
  }

  return LC[Xsize-1][Ysize-1];
 };


protected:
};

int main(){
 long datasetNum = 0; cin >> datasetNum;
 for(unsigned long dataset_i = 0; dataset_i < datasetNum; ++dataset_i){
  Dataset data;
  cout << data.getLongestCommonLength() << endl;
 }

 return 0;
};

C++: #include <bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<(n);i++)
typedef long long ll;
using namespace std;

int main(){
    int q;
    cin >> q;
    rep(ss,q){
        string x,y;
        cin >> x >> y;
        int xlen = x.size();
        int ylen = y.size();
        int dp[1001][1001];//dp[i][j]xi,yjまででのlcs
        memset(dp,0,sizeof(dp));
        rep(i,xlen)rep(j,ylen){
            if(x[i]==y[j]){
                dp[i+1][j+1] = max(dp[i+1][j+1],dp[i][j]+1);
            }
            else{
                dp[i+1][j+1] = max(dp[i+1][j],dp[i][j+1]);
            }
        }
        cout << dp[xlen][ylen] << endl;
    }
}

C++: #include <bits/stdc++.h>
using namespace std;

int lcs(string &x,string &y);

int main()
{
	int q;
	cin >> q;
	for (int i=0;i<q;++i)
	{
		string x,y;
		cin >> x >> y;
		cout << lcs(x,y) << endl;
	}
}

int lcs(string &x,string &y)
{
	const int maxlen=1000+24;
	vector<vector<int>> dp(maxlen,vector<int>(maxlen));

	int lenx=x.size();
	int leny=y.size();
	for (int i=0;i<=lenx;++i)
	{
		dp[i][0]=0;
	}
	for (int j=0;j<=leny;++j)
	{
		dp[0][j]=0;
	}

	for (int i=1;i<=lenx;++i)
	{
		for (int j=1;j<=leny;++j)
		{
			if (x[i-1]==y[j-1])
			{
				dp[i][j]=dp[i-1][j-1]+1;
			}
			else
			{
				dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
			}
		}
	}

	int maxdp=0;
	for (int j=1;j<=leny;++j)
	{
		maxdp=max(maxdp,dp[lenx][j]);
	}
	return maxdp;
}

C++: #include <bits/stdc++.h>
#define r(i,a,n) for(int i=a;i<n;i++)
using namespace std;
int main(){
  int n;
  cin>>n;
  while(n--){
    string s,ss;
    cin>>s>>ss;
    int a[ss.size()+2][s.size()+2];
    r(i,0,ss.size()+2)r(j,0,s.size()+2)a[i][j]=0;
    ss=' '+ss;
    s=' '+s;
    r(i,1,ss.size()+1){
      r(j,1,s.size()+1){
        if(ss[i]==s[j])a[i][j]=a[i-1][j-1]+1;
        else a[i][j]=max(a[i-1][j],a[i][j-1]);
      }
    }
    cout<<a[ss.size()-1][s.size()-1]<<endl;
  }
}

C++: #include <bits/stdc++.h>
using namespace std;

int calcLCS(string s, string t) {
    if (s.length() < t.length()) {
        string temp = s;
        s = t;
        t = temp;
    }

    int table[s.length()+1][t.length()+1];
    for (int i=0; i<=s.length(); i++) {
        table[i][0] = 0;
    }
    for (int j=0; j<=t.length(); j++) {
        table[0][j] = 0;
    }

    for (int i=1; i<=s.length(); i++) {
        for (int j=1; j<=t.length(); j++) {
            if (s.at(i-1) == t.at(j-1)) {
                table[i][j] = table[i-1][j-1] + 1;
            } else {
                table[i][j] = max(table[i][j-1], table[i-1][j]);
            }
        }
    }

    return table[s.length()][t.length()];
}

int main() {
    int n;
    cin >> n;
    for (int i=0; i<2*n; i+=2) {
        string x, y;
        cin >> x >> y;

        cout << calcLCS(x, y) << endl;
    }

    return 0;
}

C++: #include <bits/stdc++.h>
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 n;	cin>>n;
	for(int i=0;i<n;i++){
		cin>>s1>>s2;
		cout<<lcs(s1,s2)<<endl;
	}
	return 0;
}

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

int main()
{
    int n;
    cin >> n;
    while(n)
    {
        n--;
        string X,Y;
        int i=0,j=0;
        cin >> X;
        cin >> Y;
        int L[1001][1001];
        for(i=0;i<1001;i++)
            for(j=0;j<1001;j++)
               L[i][j]=0;
        for(i=1;i<=X.size();i++)
            for(j=1;j<=Y.size();j++)
            {
                if(X[i-1]==Y[j-1])
                    L[i][j]=1+L[i-1][j-1];
                else    L[i][j]=max(L[i][j-1],L[i-1][j]);
            }
        cout << L[X.size()][Y.size()] << endl;
    }
    return 0;
}