View Compilation Error

0_0_36663465_9318.cpp:12:11: error: redefinition of 'const long long int maxn'
 const int maxn = 2e6+10; 
           ^
0_0_36663465_9318.cpp:8:11: note: 'const long long int maxn' previously defined here
 const int maxn = 1e6+10;
           ^
0_0_36663465_9318.cpp:31:10: error: '::main' must return 'int'
 int main()
          ^