/in/foo.cc:4:7: error: 'N' was not declared in this scope
    4 | int d[N],n,m,l=1,r=0;
      |       ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:33: error: 'd' was not declared in this scope
   19 |                                 d[r]=1;//天数
      |                                 ^
/in/foo.cc:27:20: error: 'd' was not declared in this scope
   27 |                 if(d[l]>=m)break;
      |                    ^
/in/foo.cc:35:33: error: 'd' was not declared in this scope
   35 |                                 d[r]=d[l]+1;
      |                                 ^