View Compilation Error

0_0_36677629_16873.cpp: In function 'int main()':
0_0_36677629_16873.cpp:52:28: error: 'setprecision' was not declared in this scope
 cout<<fixed<<setprecision(5)<<sum[maxn-10]<<endl;
                            ^
0_0_36677629_16873.cpp:60:28: error: 'setprecision' was not declared in this scope
 cout<<fixed<<setprecision(5)<<sum[g]<<endl;
                            ^