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equal_range.cpp
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equal_range.cpp
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#include <iostream>
#include <utility>
#include <vector>
namespace std2 {
int lower_bound(std::vector<int> nums, int target) {
if (nums.empty() || nums.front() > target || nums.back() < target) {
return -1;
}
int left = 0, right = nums.size() - 1;
while (left < right) {
int mid = left + ((right - left) >> 1);
if (nums[mid] < target) {
left = mid + 1;
} else {
right = mid - 1;
}
}
return left;
}
int upper_bound(std::vector<int> nums, int target) {
if (nums.empty() || nums.front() > target || nums.back() < target) {
return -1;
}
int left = 0, right = nums.size() - 1;
while (left < right) {
int mid = left + ((right - left) >> 1);
if (nums[mid] > target) {
right = mid - 1;
} else {
left = mid + 1;
}
}
return right;
}
std::pair<int, int> equal_range(std::vector<int> nums, int target) {
if (nums.empty() || nums.front() > target || nums.back() < target) {
return {-1, -1};
}
int left = lower_bound(nums, target);
int right = upper_bound(nums, target);
std::cout << nums[left] << std::endl;
if (nums[left + 1] != target) {
return {-1, -1};
}
return {left + 1, right - 1};
}
} // end of namespace std2
int main(int argc, char const *argv[]) {
// std::vector<int> nums = {5, 7, 7, 8, 8, 8, 10}; //3, 5
// std::vector<int> nums = {5, 7, 7, 10}; // -1, -1
// int target = 8;
// std::vector<int> nums = {5, 7, 7, 8, 8, 8, 10}; //-1, -1
// int target = 11;
// std::vector<int> nums = {5, 7, 7, 8, 8, 8, 10}; //-1, -1
// std::vector<int> nums = {}; //-1, -1
// TODO: 该用例还存在问题,需要调整...
std::vector<int> nums = {4}; //?
int target = 4;
std::pair<int, int> res = std2::equal_range(nums, target);
std::cout << res.first << ", " << res.second << std::endl;
return 0;
}