Go: package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 500001), 500000)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func main() {
	fp := os.Stdin
	if len(os.Args) > 1 {
		fp, _ = os.Open(os.Args[1])
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(os.Stdout)

	n := getNextInt(scanner)
	for i := 0; i < n; i++ {
		x := getNextString(scanner)
		y := getNextString(scanner)

		fmt.Fprintln(writer, lcs(x, y))
	}

	writer.Flush()
}

func lcs(x, y string) int {
	lx := len(x)
	ly := len(y)
	dp := make([][]int, lx+1)
	for i := 0; i <= lx; i++ {
		dp[i] = make([]int, ly+1)
	}
	for i := 0; i < lx; i++ {
		for ii := 0; ii < ly; ii++ {
			if x[i] == y[ii] {
				dp[i+1][ii+1] = dp[i][ii] + 1
				continue
			}
			dp[i+1][ii+1] = dp[i][ii+1]
			if dp[i+1][ii] > dp[i+1][ii+1] {
				dp[i+1][ii+1] = dp[i+1][ii]
			}
		}
	}
	return dp[lx][ly]
}

C++: #include <bits/stdc++.h>
using namespace std;
static const int N=1000;

int lsc(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 i=1; i<=n; i++) c[0][i]=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 << lsc(s1,s2) << endl;
    }
    return 0;
}

C++: #include<stdio.h>
#include<string.h>

#define MAX 1010
#define max(a,b) ((a<b)?b:a)

char s[MAX], t[MAX];
int dp[MAX][MAX],path[MAX][MAX];

int LCS() {
  int n = strlen(s);
  int m = strlen(t);
  memset(dp,0,sizeof dp);
  int i,j,maxi=0;
  for(i=0;i<n;i++) {
    for(j=0;j<m;j++) {
      if( i ) dp[i][j] = max(dp[i][j],dp[i-1][j]);
      if( j ) dp[i][j] = max(dp[i][j],dp[i][j-1]);
      if( s[i] == t[j] ) {
	dp[i+1][j+1] = max(dp[i+1][j+1],dp[i][j]+1);
	maxi = max(maxi,dp[i+1][j+1]);
      }
    }
  }
  return maxi;
}

int main() {
  int n,i;
  scanf("%d",&n);
  for(i=0;i<n;i++) {
  scanf(" %s",&s[0]);
  scanf(" %s",&t[0]);
  printf("%d\n",LCS());
  }
  return 0;
}

C++: //
// Created by 李青坪 on 2018/10/29.
//

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

#define MAXN 150
#define MAXLEN 1000
using namespace std;

int c[MAXLEN+1][MAXLEN+1];

int getSubsequence(string x, string y){
    int i = 0, j = 0;
    while (i <= x.length()){
        while (j <= y.length()){
            if (i == 0 || j ==0){
                c[i][j] = 0;
            } else if (x[i-1] == y[j-1]){
                c[i][j] = c[i-1][j-1] + 1;
            } else if (x[i-1] != y[j-1]){
                c[i][j] = max(c[i-1][j], c[i][j-1]);
            }
            ++j;
        }
        ++i;
        j = 0;
    }
    return c[x.length()][y.length()];
}

int main(){
    int n;
    scanf("%d", &n);
    string x, y;
    for (int i = 0; i < n; ++i) {
        cin >> x >> y;
        printf("%d\n", getSubsequence(x, y));
    }

}
/*
3
abcbdab
bdcaba
abc
abc
abc
bc
 */

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 <stdio.h>
#include <string.h>
#include <vector>
#include <algorithm>
#include <string>
#pragma warning(disable : 4996)

#define MAX_L 1000

int DP[MAX_L+1][MAX_L+1];

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

int main(void) {
	int n;
	scanf("%d", &n);
	char X[MAX_L + 1];
	char Y[MAX_L + 1];
	for (int i = 0; i < n; ++i) {
		scanf("%s", &X[0]);
		scanf("%s", &Y[0]);
		int xl = strlen(X);
		int yl = strlen(Y);

		for (int j = 0; j < yl; ++j) {
			for (int i = 0; i < xl; ++i) {
				if (X[i] == Y[j]) {
					DP[j + 1][i + 1] = DP[j][i] + 1;
				}
				else {
					DP[j + 1][i + 1] = max(DP[j][i + 1], DP[j + 1][i]);
				}
			}
		}
		printf("%d\n", DP[yl][xl]);

	}

	return 0;
}

C++: #include<iostream>
#include<string>
#include<cstdio>
#define N 1000
using namespace std;

int ans[N+1][N+1];

int deal(string s1,string s2){
    int maxl=-1;

    for(int i=0;i<s1.length();i++){
        ans[i][0]=0;
    }
    for(int j=0;j<s2.length();j++){
        ans[0][j]=0;
    }
    for(int i=1;i<s1.length();i++){
        for(int j=1;j<s2.length();j++){
            if(s1[i]==s2[j]){
                ans[i][j]=ans[i-1][j-1]+1;
            }else{
                ans[i][j]=max(ans[i-1][j],ans[i][j-1]);
            }
            maxl=max(maxl,ans[i][j]);
        }
    }
    return maxl;
}

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

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

#define MAX 1000

int lcs(string x, string y) {
  int c[MAX + 1][MAX + 1];
  int m = x.size();
  int n = y.size();
  int maxl = 0;
  x = ' ' + x;
  y = ' ' + y;
  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;
}