View Compilation Error

0_0_31839700_873.cpp:3:11: error: '::main' must return 'int'
 void main()
           ^
0_0_31839700_873.cpp: In function 'int main()':
0_0_31839700_873.cpp:15:9: error: 'j' was not declared in this scope
   for ( j = i + 1; j<n; j++)
         ^