View Compilation Error

0_0_21567124_27094.cpp: In function 'void spfa(int)':
0_0_21567124_27094.cpp:28:28: error: 'memset' was not declared in this scope
  memset(dis,inf,sizeof(dis));
                            ^
0_0_21567124_27094.cpp: In function 'int main()':
0_0_21567124_27094.cpp:58:27: error: 'memset' was not declared in this scope
   memset(qdb,0,sizeof(qdb));
                           ^