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programmercarl
2024-03-28 17:14:50 +08:00
parent 304e85eaae
commit a0cfe9e7c8

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@ -119,35 +119,6 @@ public:
* 时间复杂度O(n)
* 空间复杂度O(1)
```CPP
/**
* 相向双指针方法,基于元素顺序可以改变的题目描述改变了元素相对位置,确保了移动最少元素
* 时间复杂度O(n)
* 空间复杂度O(1)
*/
class Solution {
public:
int removeElement(vector<int>& nums, int val) {
int leftIndex = 0;
int rightIndex = nums.size() - 1;
while (leftIndex <= rightIndex) {
// 找左边等于val的元素
while (leftIndex <= rightIndex && nums[leftIndex] != val){
++leftIndex;
}
// 找右边不等于val的元素
while (leftIndex <= rightIndex && nums[rightIndex] == val) {
-- rightIndex;
}
// 将右边不等于val的元素覆盖左边等于val的元素
if (leftIndex < rightIndex) {
nums[leftIndex++] = nums[rightIndex--];
}
}
return leftIndex; // leftIndex一定指向了最终数组末尾的下一个元素
}
};
```
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