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Cod sursa(job #427416)
#include <fstream>
using namespace std;
#define M 9917
ifstream f("algsort.in");
ofstream g("algsort.out");
int N, A[500001], B[500001], rez, i;
void merge_sort(int l, int r)
{
int m = (l + r) >> 1, i, j, k;
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
rez += m - i + 1, rez %= M , B[k++] = A[j++];
for (k = l; k <= r; k++) A[k] = B[k];
}
int main()
{
f >> N;
for (i = 1; i <= N; i++)
f >> A[i];
merge_sort(1,N);
for (i=1;i<=N;i++) g<<A[i]<<" ";
//g << rez % M;
return 0;
}