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Find First and Last Position of Element in Sorted Array #57

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Tracked by #100
fkdl0048 opened this issue Oct 5, 2024 · 0 comments
Closed
Tracked by #100

Find First and Last Position of Element in Sorted Array #57

fkdl0048 opened this issue Oct 5, 2024 · 0 comments
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fkdl0048 commented Oct 5, 2024

class Solution {
public:
    vector<int> searchRange(vector<int>& nums, int target) {
        vector<int> result = {-1, -1};
        int left = binarySearch(nums, target, true);
        int right = binarySearch(nums, target, false);
        result[0] = left;
        result[1] = right;
        return result;        
    }

    int binarySearch(vector<int>& nums, int target, bool isSearchingLeft) {
        int left = 0;
        int right = nums.size() - 1;
        int idx = -1;
        
        while (left <= right) {
            int mid = left + (right - left) / 2;
            
            if (nums[mid] > target) {
                right = mid - 1;
            } else if (nums[mid] < target) {
                left = mid + 1;
            } else {
                idx = mid;
                if (isSearchingLeft) {
                    right = mid - 1;
                } else {
                    left = mid + 1;
                }
            }
        }
        
        return idx;
    }    
};
  • 뭔가 억지스러운 문제라.. 단순하게 조건식으로 안풀리는 느낌
@fkdl0048 fkdl0048 mentioned this issue Oct 5, 2024
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@fkdl0048 fkdl0048 self-assigned this Oct 5, 2024
@fkdl0048 fkdl0048 added this to Todo Oct 5, 2024
@github-project-automation github-project-automation bot moved this to Todo in Todo Oct 5, 2024
@fkdl0048 fkdl0048 added this to the LeetCode milestone Oct 5, 2024
@fkdl0048 fkdl0048 moved this from Todo to Two-Week Plan in Todo Oct 5, 2024
@fkdl0048 fkdl0048 closed this as completed Oct 6, 2024
@github-project-automation github-project-automation bot moved this from Two-Week Plan to Done in Todo Oct 6, 2024
@fkdl0048 fkdl0048 mentioned this issue Oct 15, 2024
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