原題連結
題解
假設當前狀態下，所有1 的異或值為 x ，0的異或值為 y，對區間 \([l,r]\) 進行翻轉之後，對 \(x\) 的改變是 \(x=x\oplus pre[r]\oplus pre[l-1]\) y 同理
進入下一狀態，該性質也成立
線段樹做法
對於修改的區間，懶標記記錄該區間修改的次數，修改值為當前區間異或當前區間異或和
E. Data Structures Fan
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