foo.cc:4:8: warning: missing terminating " character
    4 |  cout<<"
      |        ^
foo.cc:4:8: error: missing terminating " character
foo.cc:126:24: warning: missing terminating " character
  126 |  26  27  28  29  30  31";
      |                        ^
foo.cc:126:24: error: missing terminating " character
  126 |  26  27  28  29  30  31";
      |                        ^~
foo.cc: In function 'int main()':
foo.cc:6:2: error: lvalue required as decrement operand
    6 |  2021/1
      |  ^~~~
foo.cc:7:2: error: lvalue required as decrement operand
    7 |  ----------------------------
      |  ^~

[Hydro](https://hydro.ac)提供评测服务