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// Copyright ©2015 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gen
import ""
// GraphBuilder is a graph that can have nodes and edges added.
type GraphBuilder interface {
HasEdgeBetween(xid, yid int64) bool
func abs(a int) int {
if a < 0 {
return -a
return a