#include <bits/stdc++.h>
#include <ranges>
namespace ra = std::ranges;
namespace vi = std::ranges::views;
using namespace std::string_literals;
using namespace std;

auto search(vector<int>& nums, int target) -> int
{
	auto const it = ra::lower_bound(nums, target);
	return it != nums.end() && *it == target ? distance(nums.begin(), it) : -1;
}

auto main() -> int
{
	auto nums = vector{-1,0,3,5,9,12};
	auto target = 9;
	cout << search(nums, target) << endl;
	nums = vector{-1,0,3,5,9,12};
	target = 2;
	cout << search(nums, target) << endl;
	return 0;
}