foo.cc:13:1: error: declaration of 'operator*' as non-function
   13 | }
      | ^
foo.cc:13:1: error: expected ';' at end of member declaration
   13 | }
      | ^
      |  ;
foo.cc: In function 'void Build(int, int, int)':
foo.cc:47:18: error: no match for 'operator[]' (operand types are 'Array' and 'int')
   47 | Build(rt[x],1,M,a[l]);
      |                  ^
foo.cc: In function 'int main()':
foo.cc:108:16: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  108 | scanf("%lld",&b[i][j]);
      |                ^
foo.cc:111:2: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  111 | a[i][j]=b[i][j];
      |  ^
foo.cc:111:10: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  111 | a[i][j]=b[i][j];
      |          ^
foo.cc:112:9: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  112 | if(i<x)a[i][j]-=b[i+1][j];
      |         ^
foo.cc:112:18: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  112 | if(i<x)a[i][j]-=b[i+1][j];
      |                  ^
foo.cc:113:9: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  113 | if(i>x)a[i][j]-=b[i-1][j];
      |         ^
foo.cc:113:18: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  113 | if(i>x)a[i][j]-=b[i-1][j];
      |                  ^
foo.cc:114:9: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  114 | if(j<y)a[i][j]-=b[i][j+1];
      |         ^
foo.cc:114:18: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  114 | if(j<y)a[i][j]-=b[i][j+1];
      |                  ^
foo.cc:115:9: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  115 | if(j>y)a[i][j]-=b[i][j-1];
      |         ^
foo.cc:115:18: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  115 | if(j>y)a[i][j]-=b[i][j-1];
      |                  ^
foo.cc:116:16: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  116 | if(i!=x&&j!=y)a[i][j]+=b[i+(i<x?1:-1)][j+(j<y?1:-1)];
      |                ^
foo.cc:116:25: error: no match for 'operator[]' (operand types are 'Array' and 'int')
  116 | if(i!=x&&j!=y)a[i][j]+=b[i+(i<x?1:-1)][j+(j<y?1:-1)];
      |                         ^
foo.cc:103:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  103 | scanf("%d%d",&N,&M);
      | ~~~~~^~~~~~~~~~~~~~
foo.cc:104:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  104 | scanf("%d%d",&x,&y);
      | ~~~~~^~~~~~~~~~~~~~
foo.cc:105:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  105 | scanf("%d",&Q);
      | ~~~~~^~~~~~~~~
foo.cc:121:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  121 | scanf("%d",&tp);
      | ~~~~~^~~~~~~~~~
foo.cc:122:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  122 | scanf("%d%d",&x1,&y1);
      | ~~~~~^~~~~~~~~~~~~~~~
foo.cc:123:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  123 | scanf("%d%d",&x2,&y2);
      | ~~~~~^~~~~~~~~~~~~~~~
foo.cc:130:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  130 | scanf("%lld",&d);
      | ~~~~~^~~~~~~~~~~

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