View Compilation Error

0_0_21432720_3839.cpp: In function 'int main()':
0_0_21432720_3839.cpp:42:5: error: 'res' was not declared in this scope
     res=i;
     ^
0_0_21432720_3839.cpp:44:6: error: 'res' was not declared in this scope
   if(res!=0)
      ^
0_0_21432720_3839.cpp:47:3: error: 'else' without a previous 'if'
   else if(cnt[2]+cnt[4]+cnt[6]>=2) cout<<"2"<<endl;;
   ^
0_0_21432720_3839.cpp:48:3: error: 'else' without a previous 'if'
   else cout<<"1"<<endl;
   ^