Wrong Answer
foo.cc: In function 'void dfs(int, int)': foo.cc:15:29: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 15 | if(tag[x])f[y]|=(1<<tag[x]-1); | ~~~~~~^~
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foo.cc: In function 'void dfs(int, int)': foo.cc:15:29: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] 15 | if(tag[x])f[y]|=(1<<tag[x]-1); | ~~~~~~^~
正在同步测试数据,请稍后 [Hydro](https://hydro.ac)提供评测服务