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16 lines
559 B
Python
16 lines
559 B
Python
def tri_selection(L):
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#@ ensures forall i. forall j. 0<=i<j<len(L) -> L[i]<=L[j]
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im = 0
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for i in range(len(L)):
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#@ invariant forall k. forall l. 0<=k<i<=l<len(L) -> L[k]<=L[l]
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#@ invariant forall k. forall l. 0<=k<=l<i -> L[k]<=L[l]
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im = i
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for j in range(i+1,len(L)):
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#@ invariant i<=im<j
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#@ invariant forall k. i<=k<j -> L[im]<=L[k]
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if L[j]<L[im]:
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im = j
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if im != i:
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L[im], L[i] = L[i], L[im]
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#@ assert forall k. 0<=k<i -> L[k]<=L[i]
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