[思路]数组
二分查找
public int searchInsert(int[] nums, int target) {
int len = nums.length;
int left = 0, right = len - 1;
int mid = (left + right) / 2 + 1;
while (left < right) {
if (nums[mid] == target) return mid;
if (nums[mid] < target) left = mid;
if (nums[mid] > target) right = mid;
}
return mid;
}移除元素
有序数组的平方
螺旋矩阵
区间和
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