Go: package main

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

//Util
func nextStr() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func maxInt(a, b int) int {
	if a > b {
		return a
	} else {
		return b
	}
}

func minInt(a, b int) int {
	if a > b {
		return b
	} else {
		return a
	}
}

func absInt(a int) int {
	if a >= 0 {
		return a
	} else {
		return -a
	}
}

func absFloat64(a float64) float64 {
	if a >= 0 {
		return a
	} else {
		return -a
	}
}

func minFloat64(a, b float64) float64 {
	if a > b {
		return b
	} else {
		return a
	}
}

func str2Int(s string) int {
	n, _ := strconv.Atoi(s)
	return n
}

//Main
var sc = bufio.NewScanner(os.Stdin)
var q int
var X, Y string

func lcs(X, Y string) int {
	lenX := len(X)
	lenY := len(Y)
	dp := make([][]int, lenX+1)
	for i := 0; i < lenX+1; i++ {
		dp[i] = make([]int, lenY+1)
	}

	res := 0
	for i := 1; i < lenX+1; i++ {
		for j := 1; j < lenY+1; j++ {
			if X[i-1] == Y[j-1] {
				dp[i][j] = dp[i-1][j-1] + 1
			} else {
				dp[i][j] = maxInt(dp[i-1][j], dp[i][j-1])
			}
			//fmt.Println(dp)
			res = maxInt(res, dp[i][j])
		}

	}
	return res
}

func main() {
	sc.Split(bufio.ScanWords)
	q = nextInt()

	for i := 0; i < q; i++ {
		X = nextStr()
		Y = nextStr()

		fmt.Println(lcs(X, Y))
	}
}

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

#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)

const int MAX_L=1000;//?????????????????§??????

vector<vector<int> > DP(MAX_L, vector<int>(MAX_L, -1));
string A;//?????????????????????????????????
string B;

//A???a???????????¨????????\??????B???b???????????¨????????\??????????????§????????§?????¨????????????????????????????????????
//m?????????????????????????????±??????????????????
int dev(int a, int b){
	if(DP[a][b]<0){
		int maxi= 0;
		//???????????????????????§??????
		for(int c='a'; c<='z'; ++c){
			int posa = A.find(c,a);
			int posb = B.find(c,b);
			if(posa>=0 && posb>=0){
				int tmp = dev(posa+1,posb+1);
				maxi = max(maxi, tmp+1);
			}
		}
		DP[a][b]=maxi;
	}
	return DP[a][b];
}

int main(){
	int q;
	cin >> q;
	vector<int> ans(q);
	REP(i,q){
		REP(k,MAX_L){
			REP(l,MAX_L){
				DP[k][l] = -1;
			}
		}
		cin>>A>>B;
		ans[i]=dev(0,0);
	}
	REP(i,q){
		cout<<ans[i]<<endl;
	}
	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (int)(n); i++)


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

  rep(i,q){
      string X,Y;
      cin >> X >> Y;
      int xl,yl;
      xl = X.size();
      yl = Y.size();

      vector<vector<int>> dp(xl+1,vector<int>(yl+1));
      for(int i = 0;i < xl;i++){
          for(int j = 0;j < yl;j++){
              if (X.at(i) == Y.at(j)){
                  dp.at(i+1).at(j+1) = max(dp.at(i).at(j)+1,dp.at(i+1).at(j+1));
              }
              dp.at(i+1).at(j+1) = max(dp.at(i+1).at(j+1),dp.at(i+1).at(j));
              dp.at(i+1).at(j+1) = max(dp.at(i+1).at(j+1),dp.at(i).at(j+1));
          }
      }
      cout << dp.at(xl).at(yl) << endl;


  }
  
}

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

#pragma GCC optimize "O3"
#define rep(i,a,n) for(int i=a; i<n; i++)
typedef long long ll;
typedef pair<int,int> P;
const ll MOD = (int)1e9+7;
const ll INF = MOD*MOD;
const ll powll = 1LL<<1;


int main() {
    int t;
    cin >> t;
    rep(i,0,t){
        string s1,s2;
        cin >> s1 >> s2;
        int n1 = s1.size();
        int n2 = s2.size();
        int dp[n1+1][n2+1];
        rep(j,0,n1+1){
            rep(k,0,n2+1){
                dp[j][k] = 0;
            }
        }
        rep(j,0,n1){
            rep(k,0,n2){
                if(s1[j] == s2[k]){
                    dp[j+1][k+1] = max(dp[j+1][k], dp[j][k] + 1);
                }else{
                    dp[j+1][k+1] = max(dp[j+1][k], dp[j][k+1]);
                }
            }
        }
        // rep(j,0,n1+1){
        //     rep(k,0,n2+1){
        //         cout << dp[j][k] << " ";
        //     }
        //     cout << "\n";
        // }
        cout << dp[n1][n2] << "\n";
    }
}

C++: // http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_C
// Dynamic Programming - Longest Common Subsequence

#define SUBMIT

#include <utility>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <vector>
#include <limits>
#include <numeric>
#include <functional>
#include <set>
#include <cmath>
#include <cstring>
#include <climits>
#include <memory>

using namespace std;
using ui64 = unsigned long long;
using i64 = long long;

const ui64 MAX_N = 1000;
ui64 dp[MAX_N + 1][MAX_N + 1];

ui64 compute_lcs(string x, string y) {
    memset(dp, 0, sizeof(dp));

    for (int i = 0; i < x.length(); ++i) {
        for (int j = 0; j < y.length(); ++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]);
        }
    }

    return dp[x.length()][y.length()];
}

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

    string x, y;
    for (int i = 0; i < n; ++i) {
        cin >> x >> y;
        cout << compute_lcs(x, y) << endl;
    }

    return 0;
}

C++: #pragma GCC optimize ("O3")

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include <prettyprint.hpp>
#define debug(...)  cerr << "[" << #__VA_ARGS__ << "]: ", d_err(__VA_ARGS__);
#else
#define debug(...) 83;
#endif

void d_err() {
    cerr << endl;
}

template <typename H, typename... T>
void d_err(H h, T... t) {
    cerr << h << " ";
    d_err(t...);
}

template <typename T>
void print(T x) {
    cout << x << "\n";
}

#define ALL(x) (x).begin(), (x).end()
#define FOR(i, m, n) for (int i = (m); i < (n); ++i)
#define REVFOR(i, m, n) for (int i = (n - 1); i >= (m); --i)
#define REP(i, n) FOR(i, 0, n)
#define REVREP(i, n) REVFOR(i, 0, n)
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define bcnt __builtin_popcountll

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<ll,ll> Pll;
typedef pair<int,int> Pin;

ll INF = 1e16;
int inf = 1e9;
ll MOD = 1e9+7;


int main() {
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);

    int q; cin >> q;

    REP(_, q) {
        string x, y; cin >> x >> y;

        vector<vi> dp(x.size() + 1, vi(y.size() + 1, 0));

        REP(i, x.size()) REP(j, y.size()) {
            dp[i + 1][j + 1] = max(dp[i + 1][j + 1], dp[i][j] + int(x[i] == y[j]));
            dp[i + 1][j + 1] = max(dp[i + 1][j + 1], dp[i][j+1]);
            dp[i + 1][j + 1] = max(dp[i + 1][j + 1], dp[i+1][j]);
        }

        print(dp[x.size()][y.size()]);
    }

}

C++: #include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
//BEGIN CUT HERE
int lcs(string s,string t){
  int n=s.size(),m=t.size();
  s+='$';t+='%';
  vector<vector<int> > dp(n+2,vector<int>(m+2,-(n+m)));
  dp[0][0]=0;
  for(int i=0;i<=n;i++){
    for(int j=0;j<=m;j++){
      chmax(dp[i+1][j],dp[i][j]);
      chmax(dp[i][j+1],dp[i][j]);
      chmax(dp[i+1][j+1],dp[i][j]+(s[i]==t[j]));
    }
  }
  return dp[n][m];
}
//END CUT HERE

//INSERT ABOVE HERE
signed ALDS1_10_C(){
  cin.tie(0);
  ios::sync_with_stdio(0);
  int q;
  cin>>q;
  while(q--){
    string s,t;
    cin>>s>>t;
    cout<<lcs(s,t)<<"\n";
  }
  cout<<flush;
  return 0;
}
/*
  verified on 2019/04/07
  http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ALDS1_10_C&lang=jp
*/

signed main(){
  ALDS1_10_C();
  return 0;
}