W3School TIY Editor

#include <iostream> #include <vector> #include <algorithm> using namespace std; int main() { vector<int> numbers = {1, 7, 3, 5, 9, 2}; sort(numbers.begin(), numbers.end()); auto it = lower_bound(numbers.begin(), numbers.end(), 4); if (it != numbers.end()) { cout << *it << " 是第一个大于等于 4 的值"; } else { cout << "未找到大于等于下界的元素"; } return 0; }