for i := 0; i < b.N; i++ {
		if len(a) == 0 {
			b.StopTimer()
			for j := i; j < i+n; j++ {
				a[int32(j)] = j
			}
			b.StartTimer()
		}
		delete(a, int32(i))
	}
}

func benchmarkMapAssignInt64(b *testing.B, n int) {
	a := make(map[int64]int)
	for i := 0; i < b.N; i++ {
		a[int64(i&(n-1))] = i
	}
}

func benchmarkMapOperatorAssignInt64(b *testing.B, n int) {
	a := make(map[int64]int)