View Compilation Error

0_0_33129415_30207.cpp: In function 'void Dijkstra()':
0_0_33129415_30207.cpp:38:31: error: 'memset' was not declared in this scope
  memset(dist,0x7f,sizeof(dist));
                               ^
0_0_33129415_30207.cpp: In function 'int main()':
0_0_33129415_30207.cpp:124:30: error: 'memset' was not declared in this scope
   memset(map,0x7f,sizeof(map));
                              ^