Pagini recente » Cod sursa (job #450804) | Cod sursa (job #957255) | Monitorul de evaluare | Cod sursa (job #1434504) | Cod sursa (job #398476)
Cod sursa(job #398476)
#include <cstdio>
#include <algorithm>
#define lm 2010
using namespace std;
struct poz
{
int v, p;
} c[lm];
int cmp(poz a, poz b)
{
return a.v<b.v;
}
int v[lm], n;
unsigned int a[lm][lm];
int search(int s, int d, int l, int x)
{
int m, r=0;
while (s<=d)
{
m=(s+d)/2;
if (a[l][m]>x) d=m-1; else
{
s=m+1;
r=m;
}
}
return r;
}
int main()
{
freopen("psir.in","r",stdin);
freopen("psir.out","w",stdout);
scanf("%d",&n);
int i, j, p, k;
for (i=1; i<=n; i++) scanf("%d",&v[i]);
for (i=2; i<=n; i++)
{
for (j=1; j<i; j++)
{
c[j].v=v[j];
c[j].p=j;
}
sort(c+1,c+i,cmp);
for (j=1; j<i; j++) a[i][j]=c[j].v;
for (j=1; j<i; j++)
{
k=c[j].p;
if (v[i]<v[k])
{
p=search(1,k-1,k,v[i]-1);
if (j==1) a[n-i+1][n-i+1+j]=a[n-k+1][n-k+1+p]+1; else
a[n-i+1][n-i+1+j]=a[n-i+1][n-i+1+j-1]+a[n-k+1][n-k+1+p]+1;
} else
if (v[i]>v[k])
{
p=search(1,k-1,k,v[i]);
if (j==1) a[n-i+1][n-i+1+j]=a[n-k+1][n-k+1+k-1]-a[n-k+1][n-k+1+p]+1; else
a[n-i+1][n-i+1+j]=a[n-i+1][n-i+1+j-1]+(a[n-k+1][n-k+1+k-1]-a[n-k+1][n-k+1+p])+1;
} else
{
if (j==1) a[n-i+1][n-i+1+j]=1; else
a[n-i+1][n-i+1+j]=a[n-i+1][n-i+1+j-1]+1;
}
}
}
unsigned int r=0;
for (i=1; i<n; i++) r=r+a[i][n];
printf("%u",r);
}