View Compilation Error

0_0_37603851_23954.cpp:14:20: error: conflicting declaration 'long long unsigned int P'
 unsigned long long P = 13331, nP[N], h[N];
                    ^
0_0_37603851_23954.cpp:12:24: note: previous declaration as 'const long long int P'
 const int N = 1e5 + 5, P = 13331, mod = 1e9 + 7;
                        ^
0_0_37603851_23954.cpp:19:10: error: '::main' must return 'int'
 int main() {
          ^