View Compilation Error

0_0_13122160_11358.cpp: In member function 'void road::empty()':
0_0_13122160_11358.cpp:12:39: error: 'memset' was not declared in this scope
             memset(next,0,sizeof(next));
                                       ^
0_0_13122160_11358.cpp: In function 'int main()':
0_0_13122160_11358.cpp:44:36: error: 'memset' was not declared in this scope
           memset(map,-1,sizeof(map));
                                    ^