Cod sursa(job #2969542)

Utilizator LucaT2Tasadan Luca LucaT2 Data 23 ianuarie 2023 13:22:45
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.83 kb
#include <bits/stdc++.h>

using namespace std;

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

int n,a[100005],m;

/**int cautbin0(int x)
{
    int st=1,dr=n,poz=-1;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(x>a[mij])
            st=mij+1;
        if(x<a[mij])
            dr=mij-1;
       // fout<<a[mij]<<" "<<mij<<"\n";
        if(x==a[mij])
        {
            poz=mij;
            st=mij+1;
            //fout<<poz<<"\n";
        }

        //fout<<st<<" "<<dr<<" "<<mij<<"\n";
    }
    return poz;
}

int cautbin1(int x)
{
    int st=1,dr=n,poz=-1;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(x>=a[mij]){
            st=mij+1;
            poz=mij;
        }
        if(x<a[mij])
            dr=mij-1;
    }
    return poz;
}
*/
int cautbin2(int x)
{
    int st=1,dr=n,poz=-1;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(x>a[mij]){
            st=mij+1;
        }
        if(x<=a[mij]){
            dr=mij-1;
            poz=mij;
        }
    }
    return poz;
}

int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>a[i];
    fin>>m;
    for(int i=1;i<=m;i++)
    {
        // implementare cu upper_bound din stl
        int c,x;
        int y;
        fin>>c>>x;
        if(c==0){
            //fout<<cautbin0(x)<<"\n";
            y=upper_bound(a+1,a+n+1,x)-a-1;
            if(y<=n && y>=1 && a[y]==x)
                fout<<y<<"\n";
            else fout<<-1<<"\n";
        }

        if(c==1){
           // fout<<cautbin1(x)<<"\n";
            y=lower_bound(a+1,a+n+1,x+1)-a-1;
            fout<<y<<"\n";
        }

        if(c==2){
            //fout<<cautbin2(x)<<"\n";
            y=upper_bound(a+1,a+n+1,x-1)-a;
            fout<<y<<"\n";

        }
    }
    return 0;
}