View Compilation Error

0_0_20646359_6729.cpp:18:12: error: 'N' was not declared in this scope
  dtype tmp[N];
            ^
0_0_20646359_6729.cpp: In member function 'int discrete::search(dtype)':
0_0_20646359_6729.cpp:24:8: error: 'tmp' was not declared in this scope
    if (tmp[mid] == x) return mid;
        ^
0_0_20646359_6729.cpp:25:8: error: 'tmp' was not declared in this scope
    if (tmp[mid] > x) r = mid - 1;
        ^
0_0_20646359_6729.cpp: In member function 'int discrete::init(int, dtype*)':
0_0_20646359_6729.cpp:34:30: error: 'tmp' was not declared in this scope
   for (int i = 1;i <= n;i++) tmp[i] = a[i];
                              ^
0_0_20646359_6729.cpp:35:8: error: 'tmp' was not declared in this scope
   sort(tmp + 1,tmp + n + 1);
        ^
0_0_20646359_6729.cpp:40:4: error: 'posx' was not declared in this scope
    posx[i] = search(a[i]);
    ^