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])
	}
}

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

int q;
string x, y;
int memo[1000][1000];

void init(){
  for(int i = 0; i < x.size(); i++){
    for(int j = 0; j < y.size(); j++){
      memo[i][j] = -1;
    }
  }
}

int lcs(int xp, int yp){
  if(xp < 0 || yp < 0) return 0;
  if(memo[xp][yp] >= 0) return memo[xp][yp];

  if(x[xp] == y[yp]){
    return memo[xp][yp] = lcs(xp - 1, yp - 1) + 1;
  }else{
    return memo[xp][yp] = max(lcs(xp - 1, yp), lcs(xp, yp - 1));
  }
}

int main(void){
  cin >> q;
  for(int i = 0; i < q; i++){
    cin >> x >> y;
    init();
    cout << lcs(x.size() - 1, y.size() - 1) << endl;
  }
  return 0;
}

C++: #include<bits/stdc++.h>
#define MAX 1002
#define INF 100000000
using namespace std;

int c[MAX][MAX]={},F[MAX]={};

int fib(int n){
  if(n==0||n==1)return 1;
  if(F[n]!=0)return F[n];
  return F[n]=fib(n-1)+fib(n-2);
}

void matrixChain(int p[],int n){
    int l,i,k,j,q;
    for(i=1;i<=n;i++)c[i][i]=0;
    for(l=2;l<=n;l++){
        for(i=1;i<=n-l+1;i++){
            j=i+l-1;
            c[i][j]=INF;
            for(k=i;k<j;k++){
                q=c[i][k]+c[k+1][j]+p[i-1]*p[k]*p[j];
                c[i][j]=min(c[i][j],q);
            }
        }
    }
}

void LCSLength(char *x,char *y){
    int m,n,i,j;
    for(m=0;x[m]!='\0';m++);
    for(n=0;y[n]!='\0';n++);

    // cout<<m<<" "<<n<<endl;
    for(i=0;i<MAX;i++)for(j=0;j<MAX;j++)c[i][j]=0;
    for(i=1;i<=m;i++)c[i][0]=0;
    for(j=0;j<=n;j++)c[0][j]=0;
    for(i=1;i<=m;i++){
        for(j=1;j<=n;j++){
            if(x[i-1]==y[j-1])c[i][j]=c[i-1][j-1]+1;
            else if(c[i-1][j]>=c[i][j-1])c[i][j]=c[i-1][j];
            else c[i][j]=c[i][j-1];
        }
    }
    // for(i=0;i<=m;i++){
    //     for(j=0;j<=n;j++){
    //         cout<<c[i][j];
    //     }
    //     cout<<endl;
    // }
    cout<<c[m][n]<<endl;
}


int main(){
    int n,p[MAX],i,j,k,m,g,count=0;
    char x[MAX],y[MAX];
    cin>>n;
    for(i=0;i<n;i++){
        scanf("%s",x);
        scanf("%s",y);
        LCSLength(x,y);
    }
    
    // matrixChain(p,n);
}

C++: //#define		FILE_INPUT_DEFINE
#ifdef		FILE_INPUT_DEFINE
#include	<fstream>
#endif		// FILE_INPUT_DEFINE

#include	<iostream>
#include	<string>
#include	<algorithm>

using namespace std;

#define			MAX		1000
#define			ind(x)		((x) - 1)

int C[MAX + 1][MAX + 1];

int LCS(string &X, string &Y)
{
	int			Xlen = X.length();
	int			Ylen = Y.length();

	for (int i = 0; i <= Xlen; ++i)
	{
		C[i][0] = 0;
	}

	for (int i = 0; i <= Ylen; ++i)
	{
		C[0][i] = 0;
	}

	for (int i = 1; i <= Xlen; ++i)
	{
		for (int j = 1; j <= Ylen; ++j)
		{
			if (X[ind(i)] == Y[ind(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[Xlen][Ylen]);
}

int main()
{
#ifdef		FILE_INPUT_DEFINE
	// input from txt
	std::ifstream in(R"(C:\Temp\input.txt)");
	std::cin.rdbuf(in.rdbuf());
#endif		// FILE_INPUT_DEFINE

	string	X, Y;
	int		n;

	cin >> n;
	cin.clear();
	cin.ignore();

	for (int i = 0; i < n; ++i)
	{
		getline(cin, X);
		getline(cin, Y);

		cout << LCS(X, Y) << 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] に空白を挿入
  Y = ' ' + Y;  // Y[0] に空白を挿入
  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 <cstdio>
#include <algorithm>
#include <string.h>

using namespace std;
const int N_MAX = 1000;
char x[N_MAX+10], y[N_MAX+10];
int dp[N_MAX][N_MAX];

void solve() {
  int i, j;
  scanf("%s", x);
  scanf("%s", y);
  int N = strlen(x);
  int M = strlen(y);
  //printf("N = %d M = %d", N, M);
  for (i = 0; i < N+1; i++) {
    dp[i][0] = 0;
  }
  for (j = 0; j < M+1; j++) {
    dp[0][j] = 0;
  }
  for (i = 0; i < N; i++) {
    for (j = 0; j < M; j++) {
      if (x[i] == y[j]) {
	dp[i+1][j+1] = dp[i][j]+1;
      } else {
	dp[i+1][j+1] = max(dp[i][j+1], dp[i+1][j]);
      }
    }
  }
  printf("%d\n", dp[N][M]);
} 

int main() {
  int q;
  scanf("%d", &q);
  for (int i = 0; i < q; i++) {
    solve();
  }
  return 0;
}

C++: #include <iostream>
#include <string>
#include <algorithm>
#define DATA_SIZE 1001

using namespace std;

int lcs(int dp[][DATA_SIZE], string x, string y){
    int xl = x.size();
    int yl = y.size();
    
    for(int i = 1; i <= xl; i++){
        for(int j = 1; j <= yl; 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]); }
        }
    }

    return dp[xl][yl];
}

int main(){
    int q, dp[DATA_SIZE][DATA_SIZE] = {};
    string X, Y;

    cin >> q;
    for(int i = 0; i < q; i++){
        cin >> X >> Y;
        cout << lcs(dp, X, Y) << endl;
    }

    return 0;
}

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

static const int N = 100;

int main(){
  int n, p[N + 1], m[N + 1][N + 1];
  cin >> n;
  for ( int i = 1; i <= n; i++ ){
    cin >> p[i - 1] >> p[i];
  }

  for ( int i = 1; i <= n; i++ ) m[i][i] = 0;
  for ( int l = 2; l <= n; l++ ) {
    for ( int i = 1; i <= n - l + 1; i++ ){
      int j = i + l - 1;
      m[i][j] = (1 << 21);
      for ( int k = i; k <= j - 1; k++ ) {
        m[i][j] = min(m[i][j], m[i][k] + m[k + 1][j] + p[i - 1] * p[k] * p[j]);
      }
    }
  }

  cout << m[1][n] << endl;

  return 0;
}