0_0_16930153_28997.cpp: In function 'bool judge(int, int)':
0_0_16930153_28997.cpp:12:5: error: 'x' was not declared in this scope
if(x>0&&x<=n&&y>0&&y<=n)
^
0_0_16930153_28997.cpp: In function 'int BFS(int, int)':
0_0_16930153_28997.cpp:24:28: error: 'memset' was not declared in this scope
memset(pre,-1,sizeof(pre));
^
0_0_16930153_28997.cpp:60:13: error: 'l' was not declared in this scope
u=pre[u];l
^
0_0_16930153_28997.cpp: In function 'int main()':
0_0_16930153_28997.cpp:68:14: error: 'whiel' was not declared in this scope
whiel(cin>>n)
^
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