66 人解决，86 人已尝试。
81 份提交通过，共有 157 份提交。
3.3 EMB 奖励。
单点时限: 2.0 sec
内存限制: 256 MB
The cows are having their first election after overthrowing the tyrannical Farmer John, and Bessie is one of $N$ cows $(1 \leq N \leq 50,000)$ running for President. Before the election actually happens,however, Bessie wants to determine who has the best chance of winning.
The election consists of two rounds. In the first round, the $K$ cows $(1 \leq K \leq N)$ cows with the most votes advance to the second round. In the second round, the cow with the most votes becomes President.
Given that cow i expects to get $A_i$ votes $(1 \leq A_i \leq 1,000,000,000)$ in the first round and $B_i$ votes $(1 \leq B_i \leq 1,000,000,000)$ in the second round (if he or she makes it), determine which cow is expected to win the election. Happily for you, no vote count appears twice in the $A_i$ list; likewise, no vote count appears twice in the $B_i$ list.
Line $1$: Two space-separated integers: $N$ and $K$
Lines $2 \ldots N+1$: Line $i+1$ contains two space-separated integers: $A_i$ and $B_i$
5 3 3 10 9 2 5 6 8 4 6 5
5
For the example:
There are 5 cows, 3 of which will advance to the second round. The cows expect to get 3, 9, 5, 8, and 6 votes, respectively, in the first round and 10, 2, 6, 4, and 5 votes, respectively, in the second.
Cows 2, 4, and 5 advance to the second round; cow 5 gets 5 votes in the second round, winning the election.
66 人解决，86 人已尝试。
81 份提交通过，共有 157 份提交。
3.3 EMB 奖励。