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random permutation function
func perm(n int) *map[int]int R=r OCL=19340 CL=19340
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@ -14,6 +14,7 @@ package rand
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// urand32 - return random uint32
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// nrand, nrand31, nrand63 - return 0 <= random < n
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// frand, frand64, frand32 - return 0 <= random float, float64, float32 < 1
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// perm gives a random permutation map[int]int
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const
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(
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@ -162,6 +163,22 @@ frand() float
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return float(frand64())
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}
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export func
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perm(n int) *map[int]int
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{
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m := new(map[int]int);
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for i:=0; i<n; i++ {
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m[i] = i;
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}
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for i:=0; i<n; i++ {
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j := nrand(n);
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t := m[i];
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m[i] = m[j];
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m[j] = t;
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}
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return m;
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}
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func
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init()
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{
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