0_0_16289648_25868.cpp: In function 'bool bfs()': 0_0_16289648_25868.cpp:4:38: error: 'memset' was not declared in this scope #define clr(x,c) memset(x,c,sizeof(x)) ^ 0_0_16289648_25868.cpp:29:5: note: in expansion of macro 'clr' clr(vis, false); ^