foo.cc:5:26: error: stray '#' in program
    5 | a[0][int(s[0]) % 9] += 1 #第一个字符余数
      |                          ^
foo.cc:8:23: error: stray '#' in program
    8 |     t = int(s[i]) % 9 #当前字符余数
      |                       ^
foo.cc:11:10: error: invalid preprocessing directive #f; did you mean #if?
   11 |         #f(i,j)=f(i,j)+f(i-1,j)
      |          ^
      |          if
foo.cc:13:10: error: invalid preprocessing directive #cnt
   13 |         #cnt(i,j+t)=cnt(i,j+t)+f(i-1,j)
      |          ^~~
foo.cc:1:1: error: 'mod' does not name a type
    1 | mod = 1000000007
      | ^~~

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