双指针
数组倒转
https://www.nowcoder.com/practice/3a90caee736a45e1ad70b1d4105dec5f
for (int i = 0, j = 5 ; i < j ; i ++, j --) arr[j] = arr[i] + arr[j] - (arr[i] = arr[j]);
数组倒转
https://www.nowcoder.com/practice/3a90caee736a45e1ad70b1d4105dec5f
for (int i = 0, j = 5 ; i < j ; i ++, j --) arr[j] = arr[i] + arr[j] - (arr[i] = arr[j]);
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