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Leetcode34.cpp
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103 lines (83 loc) · 2.44 KB
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// Leetcode34.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
using namespace::std;
int searchFirstHalf(vector<int>& nums, int front, int end, int target)
{
int res = -1;
if (front == end)
return front;
while (front <= end)
{
int mid = (front + end) / 2;
if (target == nums[mid])
{
res = searchFirstHalf(nums, front, mid, target);
return res;
}
else
{
res = searchFirstHalf(nums, mid + 1, end, target);
return res;
}
}
return res;
}
int searchSecondHalf(vector<int>& nums, int front, int end, int target)
{
int res = -1;
if (front == end)
return end;
while (front <= end)
{
int mid = (front + end+1) / 2;
if (target == nums[mid])
{
res = searchSecondHalf(nums, mid, end, target);
return res;
}
else
{
res = searchSecondHalf(nums, front, mid - 1, target);
return res;
}
}
return res;
}
vector<int> searchRange(vector<int>& nums, int target)
{
int leftEdge = -1, rightEdge = -1;
int front = 0, end = nums.size() - 1;
while (front <= end)
{
int mid = (front + end) / 2;
if (target == nums[mid])
{
leftEdge = searchFirstHalf(nums, front, mid, target);
rightEdge = searchSecondHalf(nums, mid, end, target);
break;
}
else if (target < nums[mid])
end = mid - 1;
else
front = mid + 1;
}
return { leftEdge, rightEdge };
}
int main()
{
vector<int> nums = { };
int target = 6;
vector<int> range = searchRange(nums, target);
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file