43 lines
610 B
Go
43 lines
610 B
Go
package main
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import (
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"cmp"
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pq "github.com/emirpasic/gods/v2/queues/priorityqueue"
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)
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const MOD int = 1_000_000_007
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type Sum struct {
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index int
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sum int
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}
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func cmpSum(a, b Sum) int {
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return cmp.Compare(a.sum, b.sum)
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}
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func rangeSum(nums []int, n int, left int, right int) int {
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q := pq.NewWith[Sum](cmpSum)
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for i, num := range nums {
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q.Enqueue(Sum{index: i, sum: num})
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}
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total := 0
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for i := 1; i <= right; i++ {
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s, _ := q.Dequeue()
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if i >= left {
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total = (total + s.sum) % MOD
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}
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if s.index < n-1 {
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s.index++
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s.sum += nums[s.index]
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q.Enqueue(s)
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}
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}
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return total
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}
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