如下所示，函式 compute_distance 遍歷一串2D點並計算每一對點之間的距離。注意每個點是用single precision浮點數表示。請回答下列問題。

void compute_distance(float x[], float y[], int N, float distance[]) {
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < N; j++) {
            float x_dist = x[i] - x[j];
            float y_dist = y[i] - y[j];
            distance[j + i * N] = sqrt(x_dist*x_dist + y_dist*y_dist);
        }
    }
}