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| class Solution {
public int findRepeatNumber(int[] nums) {
for (int i = 0; i < nums.length; i++) {
int targetIndex = nums[i];
while (nums[i] != nums[targetIndex]) {
swap(nums, i, targetIndex);
targetIndex = nums[i];
}
if (i != targetIndex) {
return nums[i];
}
}
throw new RuntimeException("Can't find repeat number");
}
private void swap(int[] nums, int i, int j) {
int tmp = nums[i];
nums[i] = nums[j];
nums[j] = tmp;
}
}
|