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 <stdio.h>

int score[1010][1010];

int max2 (int a, int b){
  if (a >= b) return a;
  else return b;
}

int len_of_str(const char s[]){
  int num = 0;

  while(s[num]) num++;

  return num;
}


int main() {
  char a[1100];
  char b[1100];
  int datanum;
  scanf("%d",&datanum);
  for(int c = 0; c < datanum; c++){

  scanf("%1100s",a);
  scanf("%1100s",b);
  int num1 = len_of_str(a);
  int num2 = len_of_str(b);


  for(int i = num1; i > 0; i--) a[i] = a[i - 1];
  a[0] = ' ';
  for(int j = num2; j > 0; j--) b[j] = b[j - 1];
  b[0] = ' ';

  for(int i = 0; i <= num1; i++) score[i][0] = 0;
  for(int j = 0; j <= num2; j++) score[0][j] = 0;

  int maximum = 0;

  for(int i = 1; i<= num1; i++){
    for (int j = 1; j <= num2; j++){
      if (a[i] == b[j])score[i][j] = score[i-1][j-1] + 1;
      else if (a[i] != b[j]) score[i][j] = max2(score[i][j-1],score[i-1][j]);
      maximum = max2(maximum,score[i][j]);
    }
  }



  printf("%d\n",maximum);
}
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int,int>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define INF 10**9

int main() {
    int n,sx,sy;
    string x,y;
    cin >> n;
    rep(i,n){
        cin >> x >> y;
        sx = x.size();
        sy = y.size();
        vector<vector<int>> c(sy+1,vector<int>(sx+1));
        rep(j,sy+1)rep(k,sx+1) c.at(j).at(k) = -1;
        rep(j,sy+1)rep(k,sx+1){
            if (j==0 or k==0){
                c.at(j).at(k) = 0;
            }
            else if (x.at(k-1) == y.at(j-1)){
                c.at(j).at(k) = c.at(j-1).at(k-1) + 1;
            }
            else {
                c.at(j).at(k) = max(c.at(j).at(k-1),c.at(j-1).at(k));
            }
        }
        cout << c.at(sy).at(sx) << endl;
    }
}

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

using namespace std;


int main(){

  string str;
  string str2;
  int n,s,s2;
  int cou[1024][1024] = {{}};
  int max = 0;

  cin >> n;

  for(int i = 0;i < n;i++){

    cin >> str >> str2;

    str = ' ' + str;
    str2 = ' ' + str2;


    s = str.size();
    s2 = str2.size();

    for(int j = 1;j < s;j++){
      for(int k = 1;k < s2;k++){
	if(str[j] == str2[k]){
	  cou[j][k] = cou[j - 1][k - 1] + 1;
	  if(cou[j][k] > max) max = cou[j][k];
	  // cout << "a: str = " << str[j] << " str2 = " << str2[k] << " cou = " << cou[j][k] << endl;
	}
	else if(cou[j - 1][k] > cou[j][k - 1]){
	  cou[j][k] =  cou[j - 1][k];
	  // cout << "str = " << str[j] << " str2 = " << str2[k] << " cou = " << cou[j][k] << endl;
	}
	else {
	  cou[j][k] = cou[j][k - 1];
	  // cout << "str = " << str[j] << " str2 = " << str2[k] << " cou = " << cou[j][k] << endl;
	}
      }
    }


    cout << max << endl;
      
    max = 0;

    for(int j = 0;j <= s;j++){
      for(int k = 0;k <= s2;k++){
	cou[j][k] = 0;
      }
    }
  }
}

C++: #include <iostream>
#include <algorithm>
#include <cmath>
#include <string.h>

using namespace std;

int dp[1010][1010];



int solve() {

	string s,t;

	cin >> s >> t;


	int max_s = s.length();
	int max_t = t.length();

	memset(dp,0, sizeof(int) * 1010 * 1010);



	for (int i = 1; i <= max_s; i++) {
		for (int j = 1; j <= max_t; j++) {
			if (s.at(i - 1) == t.at(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[max_s][max_t];
}

int main() {
	int q;

	cin >> q;

	for (int i = 0; i  < q; i++) {
		cout << solve() << endl;
	}

}

C++: //#if 0
//????????????????§£?????????????????????????????????????????????????????????C++??§string??????????????§???
//?????????????????§???????????§???AOJ?????????????????????Runtime Error??????????????????????????????
//??£????????¨??????????????????????????????????????????????????????Runtime Error???????????¨???????????????
//??§???????????????????????????????????§???
//#endif
#include<iostream>
#include<string>
#define lth 1010

using namespace std;

int main()
{
	int n, L[1010][1010], Lmax = 0, *save;
	string *Xi, *Yi;
	cin >> n;
	save = new int[n];

		Xi = new string[lth];
		Yi = new string[lth];
	

	for (int k = 0; k < n; k++)
	{
		Lmax = 0;
		string X, Y;
		cin >> X >> Y;
		for (int i = 0; i <= X.length(); i++)
		{
			if (i != 0)
				Xi[i] = X.substr(0, i );
		}
		for (int i = 0; i <= Y.length(); i++)
		{
			if (i != 0)
				Yi[i] = Y.substr(0, i );
		}
		for (int i = 0; i <= X.length(); i++)
			for (int j = 0; j <= Y.length(); j++)
			{
				if (i == 0 || j == 0)
					L[i][j] = 0;
				else if (Xi[i][i - 1] == Yi[j][j - 1])
				{
					L[i][j] = L[i - 1][j - 1] + 1;
				}
				else
				{
					L[i][j] = (L[i][j - 1] > L[i - 1][j]?L[i][j - 1] : L[i - 1][j]);
				}
				if (Lmax < L[i][j]) Lmax = L[i][j];
			}
		save[k] = Lmax;
	}

	for (int i = 0; i < n; i++)
		cout << save[i] << endl;
}

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

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

static const int N = 10000;

int lcs(string X, string Y);

int main(void){
	string s1, s2;
	int n; cin >> n;
	int i;
	REP(i, n) {
		cin >> s1 >> s2;
		cout << lcs(s1, s2) << endl;
	}
	return 0;
}

// longest common sequence
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;
	int i, j;
	FOR(i, 1, m + 1) FOR(j, 1, n + 1) {
		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;
}