View Compilation Error

0_0_32850584_30915.cpp: In function 'int main()':
0_0_32850584_30915.cpp:34:2: error: '_int64' was not declared in this scope
  _int64 N;
  ^
0_0_32850584_30915.cpp:40:9: error: expected ';' before 'z'
  _int64 z;
         ^
0_0_32850584_30915.cpp:47:8: error: 'N' was not declared in this scope
   cin>>N>>M;
        ^
0_0_32850584_30915.cpp:54:3: error: 'z' was not declared in this scope
   z=a[0];
   ^