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Cod sursa(job #527946)
#include <cstdio>
using namespace std;
int N, A[500010], B[500010];
FILE *f=fopen("algsort.in","r");
FILE *g=fopen("algsort.out","w");
void merge_sort(int l, int r) {
int i, j, k,m;
m=(l+r)/2;
if(l==r) return;
merge_sort( l, m );
merge_sort( m + 1, r );
for( i = l, j = m+1, k = l; i <= m || j <= r; )
if( j > r || (i <= m && A[i] < A[j]) )
B[ k++ ] = A[ i++ ];
else
B[ k++ ] = A[ j++ ];
for( k = l; k <= r; k++ )
A[k] = B[k];
}
int main() {
int i;
fscanf(f,"%d", &N );
for(i=1;i<=N;i++ )
fscanf(f,"%d",&A[i]);
merge_sort( 1, N );
for(i=1;i<=N;i++)
fprintf(g,"%d ",A[i]);
fclose(f);
fclose(g);
return 0;}