View Compilation Error

0_0_21567333_27213.cpp: In function 'void spfa(ll)':
0_0_21567333_27213.cpp:34:24: error: 'memset' was not declared in this scope
  memset(bj,0,sizeof(bj));
                        ^
0_0_21567333_27213.cpp: In function 'int main()':
0_0_21567333_27213.cpp:62:27: error: 'memset' was not declared in this scope
   memset(qdb,0,sizeof(qdb));
                           ^