upper_bound.cpp

#include<iostream>
#include <vector>
using namespace std;

int upper_bound(vector<int> nums, int target)
{
    int start = 0;
    int end = nums.size()-1;
    int mid = 0;
    while(start<end)
    {
        mid = start  + (end-start)/2;
        if(nums[mid]<=target)    start = mid+1;
        else   end = mid;
    }
    return start;
}

int main()
{
    vector<int> nums;
    nums.push_back(1);
    nums.push_back(2);
    nums.push_back(3);
    nums.push_back(4);
    nums.push_back(6);
    nums.push_back(6);
    nums.push_back(8);
    nums.push_back(11);
    cout<<upper_bound(nums,6);
    return 0;
}