Go: package main

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

var sc = bufio.NewScanner(os.Stdin)

func scanInt() int {
	num, _ := strconv.Atoi(scanString())
	return num
}

func scanString() string {
	sc.Scan()
	return sc.Text()
}

func init() {
	sc.Split(bufio.ScanWords)
}

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

func lcs(a, b string) int {
	lenA := len(a)
	lenB := len(b)
	dp := make([][]int, lenA+1)
	for i := range dp {
		dp[i] = make([]int, lenB+1)
	}

	for i := 1; i <= lenA; i++ {
		for j := 1; j <= lenB; j++ {
			if a[i-1] == b[j-1] {
				dp[i][j] = dp[i-1][j-1] + 1
			} else {
				dp[i][j] = max(dp[i][j-1], dp[i-1][j])
			}
		}
	}
	return dp[lenA][lenB]
}

func main() {
	n := scanInt()
	w := bufio.NewWriter(os.Stdout)
	for i := 0; i < n; i++ {
		a := scanString()
		b := scanString()
		fmt.Fprintln(w, lcs(a, b))
	}
	w.Flush()
}

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=0;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>

using namespace std;

int lcs(string s1, string s2) {
    int c[1005][1005];
    int m = s1.length();
    int n = s2.length();
    s1 = " " + s1;
    s2 = " " + s2;
    int max1 = 0;
    for (int i = 0; i <= m; i++) {
        c[i][0] = 0;
    }
    for (int i = 0; i <= n; i++) {
        c[0][i] = 0;
    }
    for (int i = 1; i <= m; i++) {
        for (int j = 1; j <= n; j++) {
            if (s1[i] == s2[j]) {
                c[i][j] = c[i - 1][j - 1] + 1;
            } else {
                c[i][j] = max(c[i - 1][j], c[i][j - 1]);
            }
            max1 = max(max1, c[i][j]);
        }
    }
    return max1;
}

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

    return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<bitset>
#include<vector>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<iomanip>
#include <functional>
using namespace std;
typedef long long ll;
const int mod = 1000000007;
const int INF = 1 << 28;
//cout << fixed << std::setprecision(9)
//memset(a, 0, sizeof(a));
//--------------------------

int lcs(string x, string y)
{
	int dp[1100][1100];
	memset(dp, 0, sizeof(dp));

	x = " " + x;
	y = " " + y;
	int n = x.size();
	int m = y.size();


	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++) {
			if (x[i] == y[j]){
				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];
}

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

	return 0;
}

C++: #include<iostream>
#include<vector>
#include<string>
#include<cstdio>
#include<set>
#include<algorithm>
#define ll long long
using namespace std;

int dp[1001][1001];
int main() {
	int b;
	scanf("%d", &b);
	char e[1001];
	char f[1001];
	for (int c = 0; c < b; c++) {
		scanf("%s%s", e, f);
		for (int g = 0; g <= strlen(e); g++) {
			for (int h = 0; h <= strlen(f); h++) {
				dp[g][h] = 0;
			}
		}
		for (int g = 0; g < strlen(e); g++) {
			for (int h = 0; h < strlen(f); h++) {
				if (e[g] == f[h]) {
					dp[g+1][h+1] = dp[g][h] + 1;
				}
				else {
					dp[g+1][h+1] = max(dp[g][h + 1], dp[g + 1][h]);
				}
			}
		}
		printf("%d\n", dp[strlen(e)][strlen(f)]);
	}
}

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

int lcs(string s1,string s2){
  int c[s1+1][s2+1];
  int m=s1.size(),n=s2.size();
  int mx=0;
  s1=' '+s1;
  s2=' '+s2;
  for(int i=1;i<=m;i++){
    for(int j=1;j<=n;j++){
      if(s1[i]==s2[j]){
	c[i][j]=c[i-1][j-1]+1;
      }else{
	c[i][j]=max(c[i-1][j],c[i][j-1]);
      }
      mx=max(mx,c[i][j]);
    }
  }
  return mx;
}


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

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

template < typename T > inline void chmax(T &a, T b) { a = max(a, b); }

void solve()
{
    string S, T;
    cin >> S >> T;
    
    vector < vector < int > > dp(S.size() + 1, vector < int >(T.size() + 1, 0));

    for ( int i = 0; i <= S.size(); i++ ) {
        for ( int j = 0; j <= T.size(); j++ ) {
            if ( i < S.size() ) chmax(dp[i + 1][j], dp[i][j]);
            if ( j < T.size() ) chmax(dp[i][j + 1], dp[i][j]);
            if ( i < S.size() && j < T.size() && S[i] == T[j] ) chmax(dp[i + 1][j + 1], dp[i][j] + 1);
        }
    }
    cout << dp[S.size()][T.size()] << endl;
}

int main()
{
    int Q;
    cin >> Q;
    while ( Q-- ) solve();
    return ( 0 );
}

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

int lcs(string x, string y)
{
	int m = x.size();
	int n = y.size();
	x = ' ' + x;		//x[0]に空白を挿入
	y = ' ' + y;		//y[0]に空白を挿入
	vector<vector<int>> c(m + 1, vector<int>(n + 1, 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]);
		}
	}
	return c[m][n];
}

int main(void)
{
	int N;
	string x, y;
	cin >> N;

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

	return 0;
}

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

using namespace std;

int main(void){
    int num;
    cin>>num;
    
    vector<vector<string>> inputData(num,vector<string>(2));

    int p=0;
    while(p<num){
        for(int i=0;i<2;i++){
            cin>>inputData[p][i];
        }
        p+=1;
    }

    int q=0;
    while(q!=num){
        int s=inputData[q][0].length();
        int t=inputData[q][1].length();
        vector<vector<int>> Table(s,vector<int>(t));

        for(int i=0;i<s;i++){
            if(inputData[q][0][0]==inputData[q][1][i]){
                Table[0][i]=1;
            }else{
                Table[0][i]=0;
            }

            if(inputData[q][0][i]==inputData[q][1][0]){
                Table[i][0]=1;
            }else{
                Table[i][0]=0;
            }
        }

        vector<int> RMax(t);
        for(int i=0;i<t;i++){
            RMax[i]=Table[0][i];
        }

        //Table作成
        for(int i=1;i<s;i++){
            int max=0;
            for(int j=1;j<t;j++){
                if(RMax[j-1]>max){
                    max=RMax[j-1];
                }
                Table[i][j]=max;
                if(inputData[q][0][i]==inputData[q][1][j]){
                    Table[i][j]+=1;
                }
            }

            for(int k=0;k<t;k++){
                if(Table[i][k]>RMax[k]){
                    RMax[k]=Table[i][k];
                }
            }
        }

        //表示
        int ans=0;
        for(int i=0;i<s;i++){
            for(int j=0;j<t;j++){
                if(Table[i][j]>ans){
                    ans=Table[i][j];
                }
            }
        }

        cout<<ans<<endl;

        // for(int i=0;i<s;i++){
        //     for(int j=0;j<t;j++){
        //         cout<<Table[i][j]<<" ";
        //     }
        //     cout<<endl;
        // }
        q+=1;
        // cout<<endl;
    }
    return 0;
}