View Compilation Error

0_0_25327559_15274.cpp: In function 'void bfs(int, int)':
0_0_25327559_15274.cpp:39:26: error: 'memset' was not declared in this scope
   memset(vi, 0, sizeof vi);
                          ^
0_0_25327559_15274.cpp: In function 'int main()':
0_0_25327559_15274.cpp:113:28: error: 'memset' was not declared in this scope
   memset(map, 0, sizeof map);
                            ^
0_0_25327559_15274.cpp:127:35: error: 'sort' was not declared in this scope
   sort(kfc.begin(), kfc.end(), cmp);
                                   ^