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An Offer 21. Adjust the array in order to make odd in even the front (loop invariant)

2022-08-09 13:54:00 【to raise pigs】 

class Solution {
    
    public int[] exchange(int[] nums) {
    
        int n = nums.length;
        int i = -1, j = 0;
        for(; j < n; j++) {
    
            if(nums[j] % 2 == 1) {
    
                int t = nums[++i];
                nums[i] = nums[j];
                nums[j] = t;                
            }
        }
        return nums;
    }
}
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