View Compilation Error

0_0_16608808_15577.cpp:11:7: error: 'N' does not name a type
 const N = 50 ;
       ^
0_0_16608808_15577.cpp:12:7: error: 'N' was not declared in this scope
 int a[N];
       ^
0_0_16608808_15577.cpp:13:12: error: 'N' was not declared in this scope
 int part = N , start = 0 ;
            ^
0_0_16608808_15577.cpp: In function 'int main()':
0_0_16608808_15577.cpp:22:2: error: 'a' was not declared in this scope
  a[1] = a[0] = 1;
  ^
0_0_16608808_15577.cpp:31:10: error: 'N' was not declared in this scope
   part = N;
          ^
0_0_16608808_15577.cpp:32:3: error: 'start' was not declared in this scope
   start = 0;
   ^