View Compilation Error

0_0_14058007_25834.cpp: In function 'void ss(int)':
0_0_14058007_25834.cpp:7:19: error: 'sqrt' was not declared in this scope
  for(i=2;i<=sqrt(n);i++)
                   ^
0_0_14058007_25834.cpp: In function 'int main()':
0_0_14058007_25834.cpp:27:41: error: invalid types 'int[int]' for array subscript
     if(n-s[j]-s[i]>=s[j]&&!q[n-s[i]-s[j]])
                                         ^