View Compilation Error

0_0_25421348_5762.cpp: In function 'int main()':
0_0_25421348_5762.cpp:27:5: error: 'cns' was not declared in this scope
     cns++;
     ^
0_0_25421348_5762.cpp:30:5: error: 'cnt' was not declared in this scope
     cnt++;
     ^
0_0_25421348_5762.cpp:34:15: error: 'cns' was not declared in this scope
   if(abs(x-y)>cns) flag=0;
               ^
0_0_25421348_5762.cpp:35:14: error: 'cnt' was not declared in this scope
   if(x+y>2*n-cnt) flag=0; //
              ^