35 lines
474 B
C++
35 lines
474 B
C++
#include "nr.h"
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namespace {
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void sift_down(Vec_IO_DP &ra, const int l, const int r)
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{
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int j,jold;
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DP a;
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a=ra[l];
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jold=l;
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j=l+1;
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while (j <= r) {
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if (j < r && ra[j] < ra[j+1]) j++;
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if (a >= ra[j]) break;
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ra[jold]=ra[j];
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jold=j;
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j=2*j+1;
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}
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ra[jold]=a;
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}
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}
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void NR::hpsort(Vec_IO_DP &ra)
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{
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int i;
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int n=ra.size();
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for (i=n/2-1; i>=0; i--)
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sift_down(ra,i,n-1);
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for (i=n-1; i>0; i--) {
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SWAP(ra[0],ra[i]);
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sift_down(ra,0,i-1);
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}
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}
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