View Compilation Error

0_0_27443872_26658.cpp: In function 'int solve()':
0_0_27443872_26658.cpp:54:19: error: 'root' was not declared in this scope
         updata(x1,root[i],root[i+1],1,50000);
                   ^
0_0_27443872_26658.cpp:56:36: error: 'l' was not declared in this scope
         k1=query(y2+1,y1,root[i+1],l,50000);
                                    ^