View Compilation Error

0_0_37329639_24871.cpp: In function 'int main()':
0_0_37329639_24871.cpp:55:3: error: 'sum' was not declared in this scope
   sum=cnt=k=0; 
   ^
0_0_37329639_24871.cpp:55:7: error: 'cnt' was not declared in this scope
   sum=cnt=k=0; 
       ^