View Compilation Error

0_0_17019689_31830.cpp: In function 'int hungary()':
0_0_17019689_31830.cpp:36:33: error: 'memset' was not declared in this scope
  memset(linker,-1,sizeof(linker));
                                 ^
0_0_17019689_31830.cpp: In function 'int main()':
0_0_17019689_31830.cpp:55:23: error: 'memset' was not declared in this scope
   memset(g,0,sizeof(g));
                       ^