View Compilation Error

0_0_33377097_10265.cpp: In function 'int sol()':
0_0_33377097_10265.cpp:171:17: error: 'build' was not declared in this scope
  build(1, 1, n+1);
                 ^
0_0_33377097_10265.cpp:175:28: error: 'update' was not declared in this scope
  update(1, 1, n+1, rk[0], 0);
                            ^
0_0_33377097_10265.cpp:179:36: error: 'sappend' was not declared in this scope
    sappend(max(0, i-k), i-1, val[i]);
                                    ^
0_0_33377097_10265.cpp:180:35: error: 'erase' was not declared in this scope
    if(i >= k) erase(i-k, i, val[i]);
                                   ^
0_0_33377097_10265.cpp: In function 'int solve()':
0_0_33377097_10265.cpp:196:11: error: 'buildSA' was not declared in this scope
  buildSA(n);
           ^