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@@ -0,0 +1,56 @@
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+package main
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+
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+import (
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+ "container/heap"
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+ "fmt"
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+)
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+
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+type pair struct {
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+ _1 int
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+ _2 int
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+}
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+
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+type maxHeap []pair
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+
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+func (h maxHeap) Len() int { return len(h) }
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+func (h maxHeap) Less(i, j int) bool { return h[j]._1 < h[i]._1 }
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+func (h maxHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
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+
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+func (h *maxHeap) Push(x interface{}) {
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+ *h = append(*h, x.(pair))
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+}
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+
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+func (h *maxHeap) Pop() interface{} {
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+ l := len(*h)
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+ x := (*h)[l-1]
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+ *h = (*h)[:l-1]
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+ return x
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+}
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+
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+func main() {
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+ var n, m int
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+ fmt.Scan(&n, &m)
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+ nums := make([]int, n)
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+ l, r := make([]int, n), make([]int, n)
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+ var h maxHeap
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+ for i := 0; i < n; i++ {
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+ fmt.Scan(&nums[i])
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+ heap.Push(&h, pair{nums[i], i})
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+ l[i] = (i + n - 1) % n
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+ r[i] = (i + 1) % n
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+ }
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+ sum := 0
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+ for i := 0; i < m; i++ {
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+ p := heap.Pop(&h).(pair)
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+ for l[p._2] == -1 {
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+ p = heap.Pop(&h).(pair)
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+ }
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+ sum += p._1
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+ left, right := l[p._2], r[p._2]
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+ l[p._2], r[p._2] = l[left], r[right]
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+ l[left], l[right] = -1, -1 // Mark element as used
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+ np := pair{nums[left] + nums[right] - p._1, p._2}
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+ heap.Push(&h, np)
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+ }
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+ fmt.Println(sum)
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+}
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