38 lines
587 B
Go
Executable File
38 lines
587 B
Go
Executable File
package main
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import "fmt"
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func sum(start, end uint64, result chan uint64) {
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var sum uint64 = 0
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for i := start; i <= end; i++ {
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sum += i
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}
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result <- sum
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}
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func main() {
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const n uint64 = 5000000000
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var numCPU int = 4
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result := make(chan uint64, numCPU)
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var chunkSize uint64 = n / uint64(numCPU)
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var start uint64 = 1
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var end uint64 = chunkSize
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for i := 0; i < numCPU; i++ {
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go sum(start, end, result)
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start = end + 1
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end += chunkSize
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}
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var total uint64 = 0
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for i := 0; i < numCPU; i++ {
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partialSum := <-result
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total += partialSum
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}
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fmt.Println(total)
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}
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