View Compilation Error

0_0_21723752_28666.cpp: In function 'void init()':
0_0_21723752_28666.cpp:163:5: error: 'hdl' was not declared in this scope
     hdl.init();
     ^
0_0_21723752_28666.cpp: In function 'int main()':
0_0_21723752_28666.cpp:173:13: error: 'hdl' was not declared in this scope
             hdl.add(x,i);
             ^
0_0_21723752_28666.cpp:196:27: error: 'hdl' was not declared in this scope
             printf("%d\n",hdl.solve(a,b,c,d));
                           ^