[USACO07NOV] Sunscreen G
题目描述
To avoid unsightly burns while tanning, each of the C (1 ≤ C ≤ 2500) cows must cover her hide with sunscreen when they're at the beach. Cow i has a minimum and maximum SPF rating (1 ≤ minSPFi ≤ 1,000; minSPFi ≤ maxSPFi ≤ 1,000) that will work. If the SPF rating is too low, the cow suffers sunburn; if the SPF rating is too high, the cow doesn't tan at all........
The cows have a picnic basket with L (1 ≤ L ≤ 2500) bottles of sunscreen lotion, each bottle i with an SPF rating SPFi (1 ≤ SPFi ≤ 1,000). Lotion bottle i can cover coveri cows with lotion. A cow may lotion from only one bottle.
What is the maximum number of cows that can protect themselves while tanning given the available lotions?
有C个奶牛去晒太阳 (1 <=C <= 2500),每个奶牛各自能够忍受的阳光强度有一个最小值和一个最大值,太大就晒伤了,太小奶牛没感觉。
而刚开始的阳光的强度非常大,奶牛都承受不住,然后奶牛就得涂抹防晒霜,防晒霜的作用是让阳光照在身上的阳光强度固定为某个值。
那么为了不让奶牛烫伤,又不会没有效果。
给出了L种防晒霜。每种的数量和固定的阳光强度也给出来了
每个奶牛只能抹一瓶防晒霜,最后问能够享受晒太阳的奶牛有几个。
输入输出格式
输入格式
\* Line 1: Two space-separated integers: C and L
\* Lines 2..C+1: Line i describes cow i's lotion requires with two integers: minSPFi and maxSPFi
\* Lines C+2..C+L+1: Line i+C+1 describes a sunscreen lotion bottle i with space-separated integers: SPFi and coveri
输出格式
A single line with an integer that is the maximum number of cows that can be protected while tanning
输入输出样例
输入样例 #1
3 2
3 10
2 5
1 5
6 2
4 1
输出样例 #1
2