View Compilation Error

0_0_26143598_23905.cpp: In function 'void init()':
0_0_26143598_23905.cpp:33:29: error: 'memset' was not declared in this scope
  memset(head,-1,sizeof(head));
                             ^
0_0_26143598_23905.cpp: In function 'void spfa(int, int)':
0_0_26143598_23905.cpp:48:22: error: 'memset' was not declared in this scope
  memset(h,0,sizeof(h));
                      ^
0_0_26143598_23905.cpp: In function 'int find(char*)':
0_0_26143598_23905.cpp:74:22: error: 'strcmp' was not declared in this scope
   if(strcmp(p,B[i].ch)==0)
                      ^
0_0_26143598_23905.cpp: In function 'bool find_bus(std::vector<bus_stop>, std::vector<bus_stop>)':
0_0_26143598_23905.cpp:80:29: error: 'strcmp' was not declared in this scope
    if(strcmp(p[i].ch,q[j].ch)==0)
                             ^