foo.cc:69:2: error: stray '`' in program
   69 |  ```
      |  ^
foo.cc:69:3: error: stray '`' in program
   69 |  ```
      |   ^
foo.cc:69:4: error: stray '`' in program
   69 |  ```
      |    ^
foo.cc: In function 'void solve()':
foo.cc:44:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   44 |         for(len=0;(1<<len)<=lim;len++);lim=(1<<len);len--;
      |         ^~~
foo.cc:44:40: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   44 |         for(len=0;(1<<len)<=lim;len++);lim=(1<<len);len--;
      |                                        ^~~
foo.cc: In function 'int main()':
foo.cc:68:65: error: expected '}' at end of input
   68 | {scanf("%d",&T);for(int z=1;z<=T;z++){solve();clear();}return 0;//拜拜程序~}
      | ~                                                               ^

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