Go: package main

import (
	. "fmt"
    "math"
)

// func init() { Println("----------------------------------------") }

func main() {
    const L_MAX = 1003

	var q int
	Scanf("%d", &q)
	X := make([]string, 0, 150)
	Y := make([]string, 0, 150)
	for i := 0; i < 2 * q; i++ {
	    var tmp string
	    Scanf("%s", &tmp)

	    if i % 2 == 0 {
	        X = append(X, tmp)
	    } else {
	        Y = append(Y, tmp)
	    }
	}

    for i := 0; i < q; i++ {
        dp := make([][]int, L_MAX)
        for k, _ := range dp {
            dp[k] = make([]int, L_MAX)
        }

        x, y := X[i], Y[i]

        // init
        isXFound := false
        for c := 0; c < len(x); c++ {
            if isXFound || y[0] == x[c] {
                dp[0][c] = 1
                isXFound = true
            }
        }
        isYFound := false
        for r := 0; r < len(y); r++ {
            if isYFound || x[0] == y[r] {
                dp[r][0] = 1
                isYFound = true
            }
        }

        for r := 1; r < len(y); r++ {
            for c := 1; c < len(x); c++ {
                // dp[r][c]
                if x[c] == y[r] {
                    dp[r][c] = int(math.Max(float64(dp[r - 1][c - 1] + 1), float64(dp[r][c])))
                }

                dp[r][c] = int(math.Max(float64(dp[r][c]), math.Max(float64(dp[r - 1][c]), float64(dp[r][c - 1]))))
            }
        }
        Println(dp[len(y) - 1][len(x) - 1])

        // LCSも求めておく
        // ans := ""
        // r, c := len(y) - 1, len(x) - 1
        // for r >= 0 && c >= 0 {
        //     if y[r] == x[c] {
        //         ans = string(x[c]) + ans
        //         r--
        //         c--
        //     } else {
        //         if dp[r - 1][c] > dp[r][c - 1] {
        //             r--
        //         } else {
        //             c--
        //         }
        //     }
        // }
        // Println(ans)
    }
}

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

using namespace std;

string s1, s2;

int lcs() {
  int i, j;
  int dp[s1.length()+1][s2.length()+1] = {};
  
  for(i = 1; i <= s1.length(); i++) {
    for(j = 1; j <= s2.length(); j++) {
      if(s1[i-1] == s2[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[s1.length()][s2.length()];
}

int main(){
  int n;
  cin >> n;
  while(n--) {
    cin >> s1 >> s2;
    cout << lcs() << endl;
  }
  
  return 0;
}

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

#define MAX 1000

int dp[MAX+1][MAX+1];

int lcs(char x[], char y[]){
  for(int i = 0; i<=strlen(x); i++){
    dp[i][0] = 0;
    dp[0][i] = 0;
  }

  for(int i = 1; i<=strlen(x); i++){
    for(int j = 1; j<=strlen(y); j++){
      dp[i][j] = (x[i] == y[j]) ? dp[i-1][j-1] + 1 :
                                  max(dp[i-1][j],dp[i][j-1]);
    }
  }

  return dp[strlen(x)][strlen(y)];
}

int main(){

  int q;
  scanf("%d", &q);

  char X[MAX + 1];
  char Y[MAX + 1];
  for(int i=0; i<q; i++){
    scanf("%s\n%s\n", X, Y);
    printf("%d\n", lcs(X, Y));
  }

  return 0;
}

C++: #include <bits/stdc++.h>
#include <math.h>
#include <vector>
#include <queue>
#include <iomanip>
#include <string>
#include <algorithm>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rep_1 (i,j,n) for(int i=j;i<n;i++)
typedef long long ll;
typedef long l;
const ll l_INF = 1010101010101010;
const int INF = 1010101010;
const int dx[] = {-1,0,1,0,-1,-1,1,1};
const int dy[] = {0,-1,0,1,1,-1,1,-1};

int main(){
  int q; cin>>q;
  rep(x,q){
    string s,t; cin>>s>>t;
    int dp[1010][1010];
    int n=s.size(),m=t.size();
    rep(i,n+1){
      rep(j,m+1){
        dp[i+1][j+1]=max(dp[i][j+1],dp[i+1][j]);
        if(s[i]==t[j])dp[i+1][j+1]=max(dp[i][j]+1,dp[i+1][j+1]);
      }
    }
    /*if(x==3){
      rep(i,n+1){
        rep(j,m+1){
          cout<<dp[i][j];
        }
        cout<<endl;
      }
    }*/
    cout<<dp[n][m]<<endl;
  }
}

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

string x;
string y;

int lcs(string x, string y){

  int c[1024][1024] = {{}};
  string nul = "0";
  x = nul + x;
  y = nul + y;


  /*
  for(int i = 0;i < x.size();i++) cout << " " << x[i];
  cout << endl;
  for(int i = 0;i < y.size();i++) cout << " " << y[i];
  cout << endl;
*/
  for(int i = 1;i < x.size();i++){
    for(int j = 1;j < y.size();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]);

/*
      for(int k = 1;k < x.size();k++){
        for(int l = 1;l < y.size();l++){
          cout << c[k][l] << ' ';
        }
        cout << endl;
      }
*/

    }
  }

  return c[x.size() - 1][y.size() - 1];
}



int main(){
  int q;
  cin >> q;

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

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

int lcs(string X,string Y){
  int c[N+1][N+1];
  int m=X.size();
  int n=Y.size();
  int maxcost=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]);
      }
      maxcost=max(maxcost,c[i][j]);
    }
  }
  return maxcost;
}

int main(){
  string s1,s2;
  int n;
  scanf("%d", &n);
  for(int i=0;i<n;i++){
    cin >> s1 >>s2;
    printf("%d\n",lcs(s1,s2));
  }
  return 0;
}

C++: /**
 * @Author: yujirotakahashi
 * @Date:   2020-05-17T20:21:41+09:00
 * @Last modified by:   yujirotakahashi
 * @Last modified time: 2020-05-25T03:33:07+09:00
 */

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

/*******  All Required define Pre-Processors and typedef Constants *******/
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define rep(i,n) for(int i=0; i<(n); ++i)
#define rep1(i,n) for(int i=1; i<=(n); ++i)
#define Dcout(a) cout << setprecision(20) << a << endl
#define MP make_pair
#define PB push_back
#define EPS 1e-9
#define PI 3.1415926535897932384626433832795
#define MOD 1000000007
//const ll INF = (1LL << 60);
//const double pi=acos(-1.0);
using ll = long long;
using PAIR = pair<int, int>;
#define debug cout << "line : " << __LINE__ << " debug" << endl
/****** Template of some basic operations *****/
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
/**************************************/

/******** User-defined Function *******/
using Graph = vector<vector<int>>;
int dx[4] = {-1,0,0,1};
int dy[4] = {0,1,-1,0};
/**************************************/

/********** Main()  function **********/
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  int q; cin >> q;

  int dp[1010][1010];
  rep(k,q){
      string x,y; cin >> x >> y;
      memset(dp, 0 ,sizeof(dp));

      dp[0][0] = 0;
      rep(i,x.size()){
          rep(j,y.size()){
              if(x[i]==y[j]){
                  chmax(dp[i+1][j+1],dp[i][j]+1);
              }else{
                  chmax(dp[i+1][j+1],dp[i+1][j]);
                  chmax(dp[i+1][j+1],dp[i][j+1]);
              }
          }
      }
      cout << dp[x.size()][y.size()] << endl;
  }

  return 0;
}
/********  Main() Ends Here *************/