View Compilation Error

0_0_21307807_21629.cpp:3:2: error: invalid preprocessing directive #inclued
 #inclued <algorithm>
  ^
0_0_21307807_21629.cpp: In function 'int main()':
0_0_21307807_21629.cpp:133:27: error: 'sqrt' was not declared in this scope
         int sqrtn = sqrt(n) + 1;
                           ^