C. Playlist---（贪心+优先队列）Educational Codeforces Round 62 (Rated for Div. 2)

Playlist 题目链接http://codeforces.com/contest/1140/problem/C time limit per test 2 seconds memory limit per test 256 megabytes 题目大意：给你n个和k，接下来n行，每行a,b；让你选择最多k个数使其a的和乘以 min(b[i])的值最大。 这题先找到思路，我们现在前k个数中寻找最

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