View Compilation Error

1_645_2683_24307.cpp: In function 'void dij(int)':
1_645_2683_24307.cpp:35:27: error: 'memset' was not declared in this scope
  memset(dis,-1,sizeof(dis));
                           ^
1_645_2683_24307.cpp: In function 'int main()':
1_645_2683_24307.cpp:97:17: error: 'sort' was not declared in this scope
   sort(M,M+m,cmp);
                 ^