View Compilation Error

0_0_21644353_26819.cpp: In function 'int main()':
0_0_21644353_26819.cpp:31:15: error: 'sum' was not declared in this scope
         cout<<sum<<endl;
               ^
0_0_21644353_26819.cpp:32:10: error: redeclaration of 'int t'
     }int t;cin>>t;
          ^
0_0_21644353_26819.cpp:5:9: note: 'int t' previously declared here
     int t;
         ^