考察点：数组
public static int find1From2(int[] a){ int len = a.length, res = 0; for(int i = 0; i < len; i++){ res= res ^ a[i]; } return res;}
考察点：数组
public static int find1From2(int[] a){ int len = a.length, res = 0; for(int i = 0; i < len; i++){ res= res ^ a[i]; } return res;}
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