foo.cpp: In function 'void SpfaL()':
foo.cpp:58:28: error: 'memset' was not declared in this scope
   memset(L, 0x7F, sizeof(L)) ;
                            ^
foo.cpp: In function 'void SpfaH()':
foo.cpp:82:25: error: 'memset' was not declared in this scope
   memset(H, 0, sizeof(L)) ;
                         ^