Cod sursa(job #1397030)

Utilizator madalomarMadalomar madalomar Data 23 martie 2015 11:07:33
Problema Descompuneri Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.96 kb
#include <fstream>
#define dim 100001
#define mod 9917
using namespace std;
ifstream fin("inv.in");
ofstream fout("inv.out");
int n,v[dim],sol,i,b[dim];
void interclasare(int st,int m, int dr)
{
    int i=st,j=m+1,nr=0;
    while(i<=m&&j<=dr)
    {
        if(v[i]<=v[j])
        {
            b[++nr]=v[i];
            if(i<=m)
                i++;
        }
        else
        {
            b[++nr]=v[j];
            j++;
            sol=(sol+(m-i+1))%mod;
        }
    }
    while(j<=dr)
    {
        b[++nr]=v[j++];
    }
    while(i<=m)
    {
        b[++nr]=v[i++];
    }
    nr=1;
    for(int i=st;i<=dr;i++)
        v[i]=b[nr++];
}

void divimp(int st, int dr)
{
    if(st<dr)
    {
        int  m=(st+dr)/2;
        divimp(st,m);
        divimp(m+1,dr);
        interclasare(st,m,dr);
    }
}
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>v[i];
    divimp(1,n);
    fout<<sol%mod;
    return 0;
}