Go: package main

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

func max(x, y int) int {
	if x < y {
		return y
	} else {
		return x
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Scan()
	n, _ := strconv.Atoi(scanner.Text())
	for i := 0; i < n; i++ {
		scanner.Scan()
		s1 := scanner.Text()
		scanner.Scan()
		s2 := scanner.Text()
		s1, s2 = " " + s1 , " " + s2
		c := make([][]int, len(s1))
		for i := range c {
			c[i] = make([]int, len(s2))
		}

		LCS := 0

		for i := 1; i < len(s1); i++ {
			for j := 1; j < len(s2); j++ {
				if s1[i] == s2[j] {
					c[i][j] = c[i-1][j-1] + 1
				} else {
					c[i][j] = max(c[i-1][j], c[i][j-1])
				}
				LCS = max(LCS, c[i][j])
			}
		}
		fmt.Println(LCS)
	}
}

C++: #include <bits/stdc++.h>

using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
typedef pair<ll, ll> Pll;
typedef vector<int> Vi;
typedef tuple<int, int, int> T;
#define FOR(i,s,x) for(int i=s;i<(int)(x);i++)
#define REP(i,x) FOR(i,0,x)
#define ALL(c) c.begin(), c.end()
#define DUMP( x ) cerr << #x << " = " << ( x ) << endl

int dp[1024][1024];

int main() {
  // use scanf in CodeForces!
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  int N;
  cin >> N;
  REP(q, N) {
    memset(dp, 0, sizeof(dp));
    string X, Y;
    cin >> X >> Y;
    int LX = X.size(), LY = Y.size();
    REP(i, LX) REP(j, LY) {
      if (X[i] == Y[j]) {
	dp[i+1][j+1] = max(dp[i][j] + 1, max(dp[i+1][j], dp[i][j+1]));
      } else {
	dp[i+1][j+1] = max(dp[i+1][j], dp[i][j+1]);
      }
    }
    cout << dp[LX][LY] << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>

#define rep(i, a, b) for (int i = a; i < (int)(b); ++i)
#define rrep(i, a, b) for (int i = b - 1; i >= (int)(a); --i)

using namespace std;

using ll = long long;
using vi = vector<int>;
using vii = vector<vi>;
using vll = vector<ll>;

int calc(vii& dp, const string& x, const string& y) {
    int m = x.size(), n = y.size();

    rep(i, 0, m) {
        rep(j, 0, n) {
            if (x[i] == y[j]) {
                dp[i + 1][j + 1] = dp[i][j] + 1;
            } else {
                dp[i + 1][j + 1] = max(dp[i][j + 1], dp[i + 1][j]);
            }
        }
    }
    return dp[m][n];
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int q;
    cin >> q;

    rep(i, 0, q) {
        string x, y;
        cin >> x >> y;

        vii dp(x.size() + 1, vi(y.size() + 1, 0));
        cout << calc(dp, x, y) << 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 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<<lcs(s1,s2)<<endl;
  }
  return 0;
}

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

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

using namespace std;

int q;
string s, t;
int dp[151][151];

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	cin >> q;
	rep(k, q) {
		cin >> s >> t;
		rep(i, 101) rep(j, 101) dp[i][j] = 0;
		rep(i, s.size()) {
			rep(j, t.size()) {
				if (s[i] == t[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[s.size()][t.size()] << "\n";
	}
	return 0;
}

C++: #include <iostream>
#include <string>
using namespace std;
int A[1005][1005]={};

int main() {
  int i,j,k,q;
  cin >> q;
  string a,b;
  for(i=0;i<q;i++) {
    cin  >> a >> b;
    int al = a.size();
    int bl = b.size();
    for(j=1;j<=al;j++) {
      for(k=1;k<=bl;k++) {
        if(a[j-1]==b[k-1]) {
          A[j][k]=A[j-1][k-1]+1;
        } else {
          A[j][k]=max(A[j][k-1],A[j-1][k]);
        }
      }
    }
    cout << A[al][bl] << endl;
  }
  return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
const int DP_SIZE = 1010;

int dp[DP_SIZE][DP_SIZE];

int main(){
	int N;
	cin >> N;
	
	for(int n=0; n<N; n++){
		for(int i=0; i<DP_SIZE; i++) for(int j=0; j<DP_SIZE; j++) dp[i][j] = 0;
		string S, T;
		cin >> S >> T;
		for(int i=0; i<(int)S.size(); i++){
			for(int j=0; j<(int)T.size(); j++){
				if(S[i] == T[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[S.size()][T.size()] << endl;
	}
	
	return 0;
}

C++: #include<bits/stdc++.h>

#define int int64_t
#define rep(i,n) for(int i=0; i<(n); i++)
#define reps(i,n) for(int i=1; i<=(n); i++)
#define pii pair<int,int>
#define gsort(x,n) sort((x),(x)+(n),greater<int>())
#define all(x) (x).begin(), (x).end()
#define ll long long
#define re(s) reverse((s).begin(),(s).end())
#define setout(n,x) setw(n) << setfill(x)
#define Fixed fixed << setprecision(10)
const long long mod = 1000000007;
using namespace std;

int q,cnt=0;
string xy[1005];
int lcs[1010][1010];
string s,v;

signed main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    cin>>q;
    rep(i,q){
        cin>>s>>v;

        rep(j,s.size()){
            rep(k,v.size()){
                if(s[j] == v[k]){
                    lcs[j+1][k+1] = lcs[j][k]+1;
                }else{
                    lcs[j+1][k+1] = max(lcs[j+1][k],lcs[j][k+1]);
                }
            }
        }
        
        cout<<lcs[s.size()][v.size()]<<'\n';
    }
}

C++: #include<bits/stdc++.h>
using ll=long long;
using namespace std;
//本の問題と全く同じ

int main(){
  //input1
  int le;
  cin>>le;
  for(int pp=0;pp<le;pp++){
    //input2
    string x,y;
    cin>>x>>y;
    int n,m;
    n=x.size();
    m=y.size();

    int dp[1001][1001];//dp[i+1][j+1]:x[0]~x[i]とy[0]~y[j]のLCSの長さ

    for(int i=0;i<n;i++){
      for(int j=0;j<m;j++){
	if(x[i]==y[j])dp[i+1][j+1]=dp[i][j]+1;//後ろが同じなら１加えていいよね
	else dp[i+1][j+1]=max(dp[i][j+1],dp[i+1][j]);}}//どっちかの共通部分列のうち長い方でいいよね
    cout<<dp[n][m]<<endl;
  }
  return 0;
}

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

static const int N = 1000;

int lcs(string X,string Y){
    int c[N+1][N+1];    //c[i][k]???Xi??¨Yk???LCS??¨??????????????????
    int m = X.size();
    int n = Y.size();
    int maxl = 0;
    X = ' ' + X; // X[0]?????????????????\
    Y = ' ' + Y;
    for(int i=1;i<=m;i++) c[i][0] = 0;
    for(int k=1;k<=n;k++) c[0][k] = 0;

    for(int i=1;i<=m;i++){
        for(int k=1;k<=m;k++){
            if(X[i]==Y[k]){
                c[i][k] = c[i-1][k-1] + 1;
            } else {
                c[i][k] = max(c[i-1][k],c[i][k-1]);
            }
            maxl = max(maxl,c[i][k]);
        }
    }

    return maxl;
}

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

int a[1001][1001] = {0};

int main(){
	int n;
	cin >> n;
	string x;
	string y;
	for ( int i = 0; i < n; i++ ) {
		cin >> x;
		cin >> y;
		for ( int j = 0; j < x.size(); j++ ) {
			int f = 0;
			for ( int k = 0; k < y.size(); k++ ) {
				if ( x[j] == y[k] ) {
					a[j+1][k+1] = a[j][k] + 1;
				}else {
					a[j+1][k+1] = max(a[j+1][k],a[j][k+1]);
				}
				cout << a[j+1][k+1];
			}
			cout << endl;
		}
		cout << a[x.size()][y.size()] << endl;
	}
	return 0;
}