Go: package main

import "fmt"

func initialize_grid(width int,height int)[][]int{
	var grid [][]int
	for i:=0;i<height+1;i++{
		var grid_row  []int
		for j:=0;j<width+1;j++{
			grid_row = append(grid_row,0)
		}
		grid = append(grid,grid_row[:])
	}
	return grid
}

func ma(x int,y int)int{
	if x >= y{
		return x
	}else{
		return y
	}
}

func main()  {
	//Take input
	var num int
	var st1,st2 string
	var string_pairs [][]string
	fmt.Scan(&num)
	for i:=0;i<num;i++{
		var string_pair []string
		fmt.Scan(&st1)
		fmt.Scan(&st2)
		string_pair = append(string_pair,st1,st2)
		string_pairs = append(string_pairs,string_pair)
	}
	//DP
	//initialize grid
	for i:=0;i<num;i++{
		string_1 := string_pairs[i][0]
		string_2 := string_pairs[i][1]

		dp := initialize_grid(len(string_2),len(string_1))

		for j:=1;j<len(string_1)+1;j++{
			for k:=1;k<len(string_2)+1;k++{
				if string_1[j-1] == string_2[k-1]{
					dp[j][k] = dp[j-1][k-1] + 1
				}else{
					dp[j][k] = ma(dp[j-1][k],dp[j][k-1])
				}
			}
		}
		fmt.Println(dp[len(string_1)][len(string_2)])
	}
}

C++: #include<bits/stdc++.h>
using namespace std;
#define inf 1e9
#define ll long long
#define ull unsigned long long
#define M 1000000007
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++)
#define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
#define IN(n,a) rep(i,n){ cin>>a[i]; }
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265


void f(){
  string x,y;
  cin>>x>>y;
  int dp[1100][1100]={};
  
  rep(i,x.length()+1){
    rep(j,y.length()+1){
      if(i==0||j==0) continue;
      if(x[i-1]==y[j-1]) dp[i][j]=dp[i-1][j-1]+1;
      else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
        }
      }
    }
  }

  cout<<dp[(int)x.length()][(int)y.length()]<<endl;
}


int main(){
  int q;
  cin>>q;
  while(q--){
    f();
  }
}

C++: #include <iostream>
#include <string>
using namespace std;
static const int MAX = 1001;

void lcs(string X, string Y) {
	int dp[MAX][MAX];  
	int i,j;

	int xLength = X.size();
	int yLength = Y.size();


	// initialize dp[][]
	for (i = 1; i <= xLength; i++)
		dp[i][0] = 0;
	for (i = 1; i <= yLength; i++)
		dp[0][i] = 0;

	for (i = 1; i <= xLength; i++){
		for (j = 1; j <= yLength; j++){
			// Because the original string is 0-based , so subtracted from 1
			if (X[i - 1] == Y[j - 1]) {
				dp[i][j] = dp[i-1][j-1] + 1;
			}else {
				dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
			}
		}
	}

	// testing code: print out the dp[][]
	// cout << "j";
	// for (j = 1; j <= yLength; j++)
	// 	cout << ' ' << j ;
	// cout << endl;
		

	// for (i = 1; i <= xLength; i++){
	// 	cout << i << '.';
	// 	for (j = 1; j <= yLength; j++){
	// 		cout << dp[i][j] << ' ';
	// 	}
	// 	cout << endl;
	// }

	cout << dp[xLength][yLength] << endl;
}

int main() {
	int n , i;
	string X, Y;

	cin >> n;
	for (i = 0 ; i < n; i++ ) {
		cin >> X;
		cin >> Y;
		lcs(X, Y);
	}

	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++){
    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] = mx(c[i - 1][j], c[i][j = 1]);
      }
      maxl = max(mxl, 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 << lcs8s1, s2) << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <set>
#include <algorithm>
#include <array>
#include <complex>
#include <utility>
#include <map>
#include <inttypes.h>

int LCS(std::string s,std::string t){
    int n,m,c[1001][1001]={0};
    n=s.size();
    m=t.size();
    int maxlen=0;
    for(int i=1;i<=n;i++){
        c[i][0]=0; 
    }
    for(int i=1;i<=m;i++){
        c[0][i]=0;
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            if(s[i-1]==t[j-1]){
                c[i][j]=c[i-1][j-1]+1;
            }else{
                c[i][j]=std::max(c[i-1][j],c[i][j-1]);
            }
            maxlen=std::max(maxlen,c[i][j]);
        }
    }
    return maxlen;
}
int main(){
	int N;
    
    std::cin >> N;
    std::string s1,s2;
    for(int i=0;i<N;i++){
        std::cin >> s1 >> s2;
        std::cout << LCS(s1,s2) <<std::endl;
    }
    return 0;
}

C++: #include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <string>
#include <vector>
#include <list>
#include <set>
#include <map>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define INT(a) int((a)+1e-9)
#define UNDEFCHAN -1
#define SUPL 1002
#define MISERU(name,value) cout<<name<<": "<<value<<endl;

int xl,yl;
char xs[SUPL],ys[SUPL];
int rss[SUPL][SUPL];

int r(int xi, int yi){
	if (rss[xi][yi]!=UNDEFCHAN) return rss[xi][yi];
	int re;
	if(xi==0) re=0;
	else if(yi==0) re=0;
	else if(xs[xi-1]==ys[yi-1]) re=r(xi-1,yi-1)+1;
	else re=max(r(xi-1,yi),r(xi,yi-1));
	rss[xi][yi]=re;
	return re;
}

int solve(){
	REP(xi,xl+1) REP(yi,yl+1) rss[xi][yi]=UNDEFCHAN;
	return r(xl,yl);
}

int main(){
	int ol;
	cin>>ol;
	REP(oi,ol){
		cin>>xs;
		cin>>ys;
		xl=strlen(xs);
		yl=strlen(ys);
		cout<<solve()<<endl;
	}
	return 0;
}

C++: #include<iostream>

using namespace std;

int max(int x, int y){
	return (x < y) ? y : x;
}

int get_lcs_len(char X[1000], char Y[1000]){
	int x_len=0, y_len=0;

	for(; 'a'<=X[x_len] && X[x_len]<='z'; x_len++);
	for(; 'a'<=Y[y_len] && Y[y_len]<='z'; y_len++);
	for(; 'A'<=X[x_len] && X[x_len]<='Z'; x_len++);
	for(; 'A'<=Y[y_len] && Y[y_len]<='Z'; y_len++);

	int dp[y_len+1][x_len+1]={};
	int result = 0;

	for(int i=1; i<=y_len; i++){
		for(int j=1; j<=x_len; j++){
			if(X[j-1] == Y[i-1]){
				dp[i][j] = dp[i-1][j-1] + 1;
			}else{
				dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
			}
			result = max(result, dp[i][j]);
		}
	}

	return result;
}

int main(){
	int q;
	char X[1000], Y[1000];

	cin >> q;

	int results[q];

	for(int i=0; i<q; i++){
		cin >> X >> Y;
		results[i] = get_lcs_len(X, Y);
	}

	for(int i=0; i<q; i++){
		cout << results[i] << endl;
	}

	return 0;
}

C++: #include <stdio.h>
#include <string.h>

#define N (1000 + 10)

#define max(a, b) (a < b ? b : a)

int dp[N][N];

int LCS(char a[], char b[]){
  int tmp;
  
  const int a_size = strlen(a); // last one is '\n'
  const int b_size = strlen(b);
  int i, j;

  memset(dp, 0, sizeof(dp));

  for (i = 1; i < a_size + 1; ++i) {
    for (j = 1; j < b_size + 1; ++j){
      if (a[i - 1] == b[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[a_size][b_size];
}

int main(void){
  int n, i;
  char a[N], b[N];

  scanf("%d\n", &n);
  for ( i = 0; i < n; i++ ){
    scanf("%s",a);
    scanf("%s",b);
    printf("%d\n", LCS(a,b));
  }
  return 0;
}

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

using namespace std;

int lcs(string s1, string s2) {
    int c[1005][1005];
    int m = s1.length();
    int n = s2.length();
    s1 = " " + s1;
    s2 = " " + s2;
    int max1=0;
    for (int i = 0; i <= m; i++) {
        c[i][0] = 0;
    }
    for (int i = 0; i <= n; i++) {
        c[0][i] = 0;
    }
    for (int i = 1; i <= m; i++) {
        for (int j = 1; j <= n; 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]);
            }
            max1=max(max1,c[i][j]);
        }
    }
    return max1;
}

int main() {
    int q;
    cin >> q;
    string s1, s2;
    for (int k = 0; k < q; k++) {
        cin >> s1;
        cin >> s2;
        cout<<lcs(s1,s2)<<endl;
    }

    return 0;
}