Language: Java

import java.util.*;
import java.io.*;

class　Main{
    static long MOD=1000000007;
    static long[][] dp;
    public static void main(String[] args){
        FastScanner fsc=new FastScanner();
        int n=fsc.nextInt(), m=fsc.nextInt();
        int[] s=new int[n];
        int[] t=new int[m];
        for(int i=0;i<n;i++) s[i]=fsc.nextInt();
        for(int j=0;j<m;j++) t[j]=fsc.nextInt();
        fsc.close();
        dp=new long[n+1][m+1];
        for(int i=n;i>=0;i--){
            for(int j=m;j>=0;j--){
                if(i==n) dp[i][j]=0;
                else if(i==n-1){
                    if(j==m) dp[i][j]=0;
                    else if(s[i]==t[j]) dp[i][j]=dp[i][j+1]+1;
                    else dp[i][j]=dp[i][j+1];
                }
                else{
                    if(j==m) dp[i][j]=0;
                    else if(s[i]==t[j]){
                        if(j==m-1) dp[i][j]=dp[i+1][j]+1;
                        else dp[i][j]=dp[i+1][j]+dp[i][j+1]+1;
                    }
                    else{
                        dp[i][j]=dp[i][j+1]+dp[i+1][j]-dp[i+1][j+1];
                    }
                }
                dp[i][j]%=MOD;
            }
        }
        // for(int i=0;i<n;i++){
        //     for(int j=0;j<m;j++){
        //         System.out.print("dp["+i+"]["+j+"]:"+dp[i][j]+" ");
        //     }
        //     System.out.println("");
        // }
        System.out.println(dp[0][0]+1);
    }
    static class FastScanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;
        private boolean hasNextByte(){
            if(ptr<buflen) return true;
            else{
                ptr = 0;
                try{
                    buflen = in.read(buffer);
                }
                catch(IOException e){
                    e.printStackTrace();
                }
                if(buflen<=0) return false;
            }
        return true;
        }
        private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
        private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
        public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
        public String next() {
            if (!hasNext()) throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while(isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }
        public long nextLong() {
            if (!hasNext()) throw new NoSuchElementException();
            long n = 0;
            boolean minus = false;
            int b = readByte();
            if (b == '-') {
                minus = true;
                b = readByte();
            }
            if (b < '0' || '9' < b) throw new NumberFormatException();
            while(true){
                if ('0' <= b && b <= '9') {
                    n *= 10;
                    n += b - '0';
                }
                else if(b == -1 || !isPrintableChar(b)) return minus ? -n : n;
                else throw new NumberFormatException();
                b = readByte();
            }
        }
        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
            return (int) nl;
        }
        public double nextDouble() { return Double.parseDouble(next());}
        public void close(){
            try{in.close();}
            catch(IOException e){e.printStackTrace();}
        }
    }
}

Compiler output:
Main.java:4: error: illegal character: '\u3000'
class?Main{
     ^
1 error