View Compilation Error

0_0_35326964_24489.cpp: In function 'void dijkstra()':
0_0_35326964_24489.cpp:17:28: error: 'memset' was not declared in this scope
  memset(vis, 0, sizeof(vis));
                            ^
0_0_35326964_24489.cpp: In function 'int main()':
0_0_35326964_24489.cpp:67:20: error: 'strcmp' was not declared in this scope
   if (strcmp(st, en) == 0)
                    ^