liu·jiahua
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int[] arr = new int[] { 0, 3, 3, 2, 9, 8, 1, 6, 5, 8 };
int[] index = new int[] { 7, 3, 2, 6, 8, 8, 6, 7, 7 };
string str = string.Empty;
foreach (var item in index)
{
str += arr[item];
}
Console.WriteLine(str);
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