foo.cc:11:21: error: expected type-specifier before '{' token
 long long *operator {
                     ^
foo.cc:13:1: error: expected ';' at end of member declaration
 }
 ^
foo.cc: In function 'void Build(int, int, int)':
foo.cc:47:18: error: no match for 'operator[]' (operand types are 'Array' and 'int')
 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')
 scanf("%lld",&b[i][j]);
                ^
foo.cc:111:2: error: no match for 'operator[]' (operand types are 'Array' and 'int')
 a[i][j]=b[i][j];
  ^
foo.cc:111:10: error: no match for 'operator[]' (operand types are 'Array' and 'int')
 a[i][j]=b[i][j];
          ^
foo.cc:112:9: error: no match for 'operator[]' (operand types are 'Array' and 'int')
 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')
 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')
 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')
 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')
 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')
 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')
 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')
 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')
 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')
 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]
 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]
 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]
 scanf("%d",&Q);
 ~~~~~^~~~~~~~~
foo.cc:121:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&tp);
 ~~~~~^~~~~~~~~~
foo.cc:122:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 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]
 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]
 scanf("%lld",&d);
 ~~~~~^~~~~~~~~~~

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