View Compilation Error

0_0_33645267_3123.cpp: In function 'int hungary()':
0_0_33645267_3123.cpp:61:32: error: 'memset' was not declared in this scope
     memset(mark,-1,sizeof(mark));  
                                ^
0_0_33645267_3123.cpp: In function 'int main()':
0_0_33645267_3123.cpp:79:30: error: 'memset' was not declared in this scope
   memset(head,-1,sizeof(head));
                              ^