Submission #8887641

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Source Code Expand

package main

import (
	"fmt"
)

func main() {
	var n, k int
	fmt.Scan(&n, &k)
	ws := make([][]int, n)
	for i := 0; i < n; i++ {
		var w, p int
		fmt.Scan(&w, &p)
		ws[i] = []int{w, p}
	}
	var sum int
	var salt float64
	ms := make([]int, n)
	for i := 0; i < k; i++ {
		var mj int
		var m float64
		for j := 0; j < n; j++ {
			if ms[j] == 0 {
				r := (salt + float64(ws[j][0])*float64(ws[j][1])) / (float64(sum) + float64(ws[j][0]))
				if r > m {
					m = r
					mj = j
				}
			}
		}
		sum += ws[mj][0]
		salt += float64(ws[mj][0]) * float64(ws[mj][1])
		ms[mj] = 1
	}
	fmt.Println(salt / float64(sum))
}

Submission Info

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