“`” 考察点：数组
<pre><code class=""language-java"" lang=""java"">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;
}
</code></pre>
<pre><code> "“`
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