View Compilation Error

0_0_21937061_12231.cpp: In function 'void init()':
0_0_21937061_12231.cpp:72:34: error: 'memset' was not declared in this scope
     memset(dis, 0x3f, sizeof(dis));
                                  ^
0_0_21937061_12231.cpp: In function 'int main()':
0_0_21937061_12231.cpp:128:36: error: 'memset' was not declared in this scope
         memset(hed, -1, sizeof(hed));
                                    ^