View Compilation Error

0_0_24864499_10900.cpp: In function 'void dij(int)':
0_0_24864499_10900.cpp:38:26: error: 'memset' was not declared in this scope
  memset(vis,0,sizeof(vis));
                          ^
0_0_24864499_10900.cpp: In function 'int main()':
0_0_24864499_10900.cpp:90:32: error: 'memset' was not declared in this scope
   memset(istre,-1,sizeof(istre));
                                ^