|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|1 초||128 MB||0||0||0||0.000%|
Some amount of water is poured into a barrel, then a number of cubes of different size and density are put into water. Finally, a lid is put onto the barrel and pushed down until it touches the edges of the barrel.
Write a program to compute the resulting water level in the barrel.
It can be assumed that:
The first line of the input contains three real numbers --- the bottom area of the barrel, S (0 < S ≤ 1000), the height of the barrel, H (0 < H ≤ 1000), and the volume of water, V (0 < V ≤ S∙H). The next line contains the number of cubes, N (0 < N ≤ 1000). It is followed by N lines, each containing two real numbers describing a cube --- the length of a side of the cube, L (0 < L ≤ 1000), and the density of the cube, D (0 < D ≤ 10).
The first and only line of the output must contain one real number --- the resulting water level. The output must not differ from the correct value by more than 10-4.
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