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/*
 * https://leetcode.cn/problems/bulb-switcher/
 * 
 *  n 
 * 
 *  i  i  i 
 *  n 
 * 
 *  n 
 * 
 *  1
 * n = 3
 * 1
 * 
 * ,  [, , ].
 * ,  [, , ].
 * ,  [, , ].
 * ,  [, , ].
 *  1
 * 
 *  2
 * n = 0
 * 0
 * 
 *  3
 * n = 1
 * 1
 * 
 * 
 * 0
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