Cod sursa(job #348996)

Utilizator PopaStefanPopa Stefan PopaStefan Data 17 septembrie 2009 18:58:25
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.35 kb
#include<fstream.h>

ifstream fin("cautbin.in");
ofstream fout("cautbin.out");

int n,m;
long a[100100];

void citire()
{long i;
fin>>n;
for(i=1;i<=n;i++)
  fin>>a[i];
fin>>m;
}

int tip_0(long x)
{long long st,dr,mij,i;
st=1;dr=n;
while(st<=dr)
  {mij=st+(dr-st)/2;
   if(a[mij]==x) {for(i=mij+1;a[i]==x;i++);
                return i-1;
               }
     else if(a[mij]>x) dr=mij-1;
             else st=mij+1;
  }
return -1;
}

int tip_1(long x)
{long st,dr,mij,i;
st=1;dr=n;
while(st<=dr)
  {mij=st+(dr-st)/2;
   if(a[mij]==x) {for(i=mij+1;a[i]==x;i++);
                return i-1;
               }
     else if(a[mij]>x) dr=mij-1;
             else if(a[mij+1]>x) return mij;
                     else st=mij+1;
  }
}

int tip_2(long x)
{long st,dr,mij,i;
st=1;dr=n;
while(st<=dr)
  {mij=st+(dr-st)/2;
   if(a[mij]==x) {for(i=mij-1;a[i]==x;i--);
                return i+1;
               }
     else if(a[mij]>x)  if(a[mij-1]<x) return mij;
                           else dr=mij-1;
             else st=mij+1;
  }
}

void rezolvare()
{long i;
short tip;
long x;
for(i=1;i<=m;i++)
  {fin>>tip>>x;
  if(tip==0) fout<<tip_0(x)<<'\n';
     else if(tip==1) fout<<tip_1(x)<<'\n';
             else fout<<tip_2(x)<<'\n';
  }
}

int main()
{citire();
rezolvare();
fin.close();
fout.close();
return 0;
}