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Search Insert Position
Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.
You may assume no duplicates in the array.
Here are few examples.
[1,3,5,6], 5 → 2
[1,3,5,6], 2 → 1
[1,3,5,6], 7 → 4
[1,3,5,6], 0 → 0
思路：因为序列有序，使用二分查找即可。返回start。
1 class Solution { 2 public: 3 int searchInsert( int A[], int n, int target ) { 4 int start = 0, end = n-1; 5 while( start <= end ) { 6 int middle = ( start + end ) / 2; 7 if( A[middle] == target ) { return middle; } 8 if( A[middle] < target ) { 9 start = middle+1;10 } else {11 end = middle-1;12 }13 }14 return start;15 }16 };
也可以调用标准库函数lower_bound：
1 class Solution {2 public:3 int searchInsert( int A[], int n, int target ) {4 int *ptr = lower_bound( A, A+n, target );5 return ptr - A;6 }7 };
Search Insert Position
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