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Cod sursa(job #41160)
#include<stdio.h>
int s[1002][35],a[1002],b[1002],c[1002],aux[35],lim,cst=30;
void intersc(int i,int j)
{
int x;
for(x=0;x<=lim;x++)
aux[x]=s[i][x];
for(x=0;x<=lim;x++)
s[i][x]=s[j][x];
for(x=0;x<=lim;x++)
s[j][x]=aux[x];
}
int cmp(int i,int j)
{
int x=0;
while(x<=lim && s[i][x]==s[j][x]) x++;
if(x>lim) return 0;
if(s[i][x]<s[j][x])
return -1;
return 1;
}
int main()
{
FILE *fin=fopen("regiuni.in","r"),
*fout=fopen("regiuni.out","w");
int m,n,i,j,x,y,k;
fscanf(fin,"%d%d",&n,&m);
for(i=1;i<=n;i++)
fscanf(fin,"%d%d%d",&a[i],&b[i],&c[i]);
for(i=1;i<=m;i++)
{
fscanf(fin,"%d%d",&x,&y);
for(j=1;j<=n;j++)
if(a[j]*x+b[j]*y+c[j]>0)
s[i][j/cst]|=(1<<(j%cst));
}
lim=n/cst;
//sortare
for(i=1;i<=m;i++)
{
j=i;
while(j/2 && cmp(j,j/2) > 0)
{
intersc(j/2,j);
j/=2;
}
}
i=m;
while(i>1)
{
intersc(1,i);
i--;
j=1;
while(1)
{
k=2*j;
if(k>i) break;
if(k+1<=i && cmp(k+1,k)>0) k++;
if(cmp(j,k) >= 0) break;
intersc(j,k);
j=k;
}
}
int sol=1;
for(i=2;i<=m;i++)
if(cmp(i,i-1))
sol++;
fprintf(fout,"%d\n",sol);
fclose(fin);
fclose(fout);
return 0;
}