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 f() {
	var S, T string
	fmt.Scan(&S)
	fmt.Scan(&T)
	lenS, lenT := len(S), len(T)
	dp := make([][]int, lenS+1)
	for i:=0; i<lenS+1; i++ {
		dp[i] = make([]int, lenT+1)
	}
	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])
}

func main(){
	var n int 
	fmt.Scan(&n)
	for i:=0; i<n; i++ {
		f()
	}
}

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;
}

C++: #include<bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)

typedef long long ll;
typedef pair<int, int> P;

#define MAX 100005
#define INF INT_MAX

string x, y;
vector < vector<int> > memo;

int lcs(int xs, int ys)
{
    if (xs == 0 || ys == 0) return 0;
    if (memo[xs][ys]) return memo[xs][ys];

    int res;
    if (x[xs-1] == y[ys-1]) {
        res = lcs(xs-1, ys-1) + 1;
    } else {
        res = max(lcs(xs,ys-1), lcs(xs-1,ys));
    }
    memo[xs][ys] = res;
    return res;
}

int main(int, char**)
{
    int q;
    cin >> q;

    vector<int> ans;
    rep(i,q) {
        cin >> x >> y;
        int xs = x.size();
        int ys = y.size();
        memo.assign(xs+1, vector<int>(ys+1,0));
        ans.push_back(lcs(xs,ys));
    }

    rep(i,q) cout << ans[i] << endl;
    return 0;
}