find_if is not returning the expected output

I am using find_if to find the next higher value in a vector. It is returning the next index and not a higher value.

The input vector is:
vector<int> height = { 1,8,6,2,5,4,8,3,7 };

I am looking for the next highest value, starting at i=0, height[0] is 1. The code updates to set i=1, height[1] = 8. I expect to get i = 7. I get i = 2

    for (size_t i = 0; i < height.size() - 1; i++)
    {   
        auto res = std::find_if((height.begin() + i + 1), height.end(),
            [&height, i](int x) {           
            return height[x] >= height[i];
        });
        auto higher_index = std::distance(height.begin(), res);

        if (res != height.end() && higher_index < height.size())
        {
            // found the next highest height
            // calculate new area and make i the same as highest height
            area = min(height[i], height[higher_index]) * (higher_index - i);
            maxA = max(maxA, area);
            i = higher_index - 1;
        }
    }

>Solution :

Your lambda should look like this

    [&height, i](int x) {           
        return x >= height[i];
    }

find_if passes the value of each element of the given sequence to the predicate. Not the index of each element.