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

int main() {
    int q;
    cin >> q;
    while (q--) {
        string X, Y;
        cin >> X >> Y;
        int dp[X.size() + 1][Y.size() + 1];
        memset(dp, 0, sizeof(dp));
        for (int i = 0; i < X.size(); ++i) {
            for (int j = 0; j < Y.size(); ++j) {
                if (X[i] == Y[j]) {
                    dp[i + 1][j + 1] = dp[i][j] + 1;
                } else {
                    dp[i + 1][j + 1] = max(dp[i + 1][j], dp[i][j + 1]);
                }
            }
        }
        cout << dp[X.size()][Y.size()] << endl;
    }

    return 0;
}

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

#define NUM 1000

string X;
string Y;
int dp[NUM + 1][NUM + 1];

void init(){
    for(int i = 0; i < NUM + 1; i++){
        for(int j = 0; j < NUM + 1; j++){
            dp[i][j] = 0;
        }
    }
}

void calc(void){
    init();

    for(int j = 1; j <= Y.size(); j++){
        for(int i = 1; i <= X.size(); i++){
            if(Y[j] == X[i]){
                dp[i][j] = dp[i - 1][j - 1] + 1;
            }else{
                dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
            }
        }
    }
    
    printf("%d\n", dp[X.size()][Y.size()]);

}

int main(void){
    int q;
    scanf("%d", &q);

    for(int i = 0; i < q; i++){
        cin >> X;
        cin >> Y;
        calc();
    }
}

C++: #include <iostream>

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

int solve(std::string x, std::string y) {
  int m = x.length();
  int n = y.length();
  int lcs[m + 1][n + 1];
  rep(i, m + 1) lcs[i][0] = 0;
  rep(j, n + 1) lcs[0][j] = 0;

  for (int i = 1; i <= m; ++i) {
    for (int j = 1; j <= n; ++j) {
      if (x[i - 1] == y[j - 1])
        lcs[i][j] = lcs[i - 1][j - 1] + 1;
      else
        lcs[i][j] = std::max(lcs[i - 1][j], lcs[i][j - 1]);
    }
  }

  return lcs[m][n];
}

int main() {
  int n;
  std::cin >> n;
  std::string x, y;

  rep(i, n) {
    std::cin >> x >> y;
    std::cout << solve(x, y) << '\n';
  }
  return 0;
}

C++: q = int(input())
ans = []
for i in range(q):
    x = input()
    y = input()
    n = len(x)
    m = len(y)
    dp1 = [0]*(m+1)
    for i in range(n):
        s = x[i]
        dp2 = dp1[:]
        for j in range(m):
            if s == y[j]:
                dp1[j+1] = dp2[j]+1
            elif dp1[j+1] < dp1[j]:
                dp1[j+1] = dp1[j]
    ans.append(dp1[-1])
print(*ans, sep="\n")

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

using namespace std;

//L[i][j] X[0]..X[i]??¨X[0]..Y[j]???LCS
int L[1001][1001]={};
int main(){
  int testnum;
  cin>>testnum;
  for(int t=0;t<testnum;++t){
    string X,Y;
    cin>>X>>Y;

    for(int i=1;i<=X.length();++i){
      for(int j=1;j<=Y.length();++j){
        if(X[i]==Y[j])
          L[i][j] = 1 + L[i-1][j-1];
        else
          L[i][j] = max(L[i][j-1],L[i-1][j]);
      }
    }

    cout << L[X.length()][Y.length()] << endl;
  }

  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
//#define ll long long
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
#define rep(i, n) REP(i, 0, n)
#define rep_rev(i, n) for (int (i) = (int)(n) - 1 ; (i) >= 0 ; --(i))
#define ALL(v) v.begin(), v.end()
#define MSG(a) cout << #a << " " << a << endl;
#define REP(i, x, n) for(int i = x; i < n; i++)
#define all(x) (x).begin(),(x).end()
ll t1,t2,t3;
const ll mod = 1000000007;
const int INF = 1e9;
const ll INFLONG = 1e18;

int main(){
  ll q;
  cin >> q;
  string str1,str2;
  rep(_,q){
    cin >> str1;
    cin >> str2;
    ull len1 = str1.size();
    ull len2 = str2.size();
    vector<vector<ll>> dp(len1+1,vector<ll> (len2+1,0));
    rep(i,len1){
      rep(j,len2){
        dp[i+1][j+1] = max(dp[i][j+1],dp[i+1][j]);
        if(str1[i] == str2[j]){
          chmax(dp[i+1][j+1],dp[i][j] + 1);
        }
      }
    }
    cout << dp[len1][len2] << endl;
  }
}

C++: #include <iostream>
#include <string>
using namespace std;
int main(void){
   long L[1010][1010], Z; 
   string X, Y; 
   int q;  
    cin >> q; 
  for(int k=0; k<q; k++){ 
      cin >> X;  
      cin >> Y; 
      for(int i=0; i<X.size(); i++){   
            for(int j=0; j<Y.size(); j++){
           L[i][j] = 0;
            }
      }
      for(int i=0; i<X.size(); i++){
       for(int j=0; j<Y.size(); j++){
           if(i<=0 || j<=0){
               if(X[i]==Y[j])  L[i][j]=1;
               else            L[i][j]=0;
           }
           else if(X[i] == Y[j])
                L[i][j]=1+L[i-1][j-1];
           else L[i][j]=max(L[i][j-1], L[i-1][j]); 
          Z=L[i][j];
       } 
     } 
     cout << Z << 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;
	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]);
			}
			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;
}