View Compilation Error

0_0_26963842_10297.cpp: In function 'int main()':
0_0_26963842_10297.cpp:7:20: error: 'memset' was not declared in this scope
     memset(a,'/0',3);
                    ^
0_0_26963842_10297.cpp:9:19: error: 'sort' was not declared in this scope
         sort(a,a+3);
                   ^