foo.cpp: In function 'int henghuan(int, int)':
foo.cpp:49:1: warning: no return statement in function returning non-void [-Wreturn-type]
foo.cpp: In function 'int zhonghuan(int, int)':
foo.cpp:68:1: warning: no return statement in function returning non-void [-Wreturn-type]
foo.cpp: In function 'int bfs()':
foo.cpp:201:1: warning: no return statement in function returning non-void [-Wreturn-type]
foo.cpp: In function 'int main()':
foo.cpp:237:33: error: 'memset' was not declared in this scope