lcs2.py

#Uses python3
import sys

def lcs2(X, Y):
    m = len(X) 
    n = len(Y) 
    L = [[None]*(n+1) for i in range(m+1)] 
    for i in range(m+1): 
        for j in range(n+1): 
            if i == 0 or j == 0 : 
                L[i][j] = 0
            elif X[i-1] == Y[j-1]: 
                L[i][j] = L[i-1][j-1]+1
            else: 
                L[i][j] = max(L[i-1][j] , L[i][j-1]) 
    return L[m][n] 

if __name__ == '__main__':
    input = sys.stdin.read()
    data = list(map(int, input.split()))

    n = data[0]
    data = data[1:]
    a = data[:n]

    data = data[n:]
    m = data[0]
    data = data[1:]
    b = data[:m]

    print(lcs2(a, b))