View Compilation Error

0_0_26388957_5912.cpp: In function 'int main()':
0_0_26388957_5912.cpp:10:29: error: 'memset' was not declared in this scope
         memset(m,0,sizeof(m));
                             ^
0_0_26388957_5912.cpp:40:43: error: 'max_element' was not declared in this scope
                 cout<<*max_element(m+1,m+5)<<endl;
                                           ^