Cod sursa(job #2987710)

Utilizator Dora_ElenaSerbina Dora Elena Dora_Elena Data 2 martie 2023 18:22:54
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.23 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int v[100005];
int cautbin1(int x, int n){
    int st=1;
    int dr=n;
    int ans=-1;
    while(st<=dr){
        int med=(st+dr)/2;
        if(v[med]<=x){
            st=med+1;
            ans=med;
        }
        else{
            dr=med-1;
        }
    }
    return ans;
}
int cautbin2(int x, int n){
    int st=1;
    int dr=n;
    int ans=-1;
    while(st<=dr){
        int med=(st+dr)/2;
        if(v[med]>=x){
            dr=med-1;
            ans=med;
        }
        else{
            st=med+1;
        }
    }
    return ans;
}
int main()
{
    int n,m,dr,st,med,ans,x,op,y;
    fin>>n;
    for(int i=1;i<=n;i++){
        fin>>v[i];
    }
    fin>>m;
    for(int i=1;i<=m;i++){
        fin>>op>>x;
        if (op == 0) {
            y=cautbin1(x,n);
            if(v[y]!=x){
                fout<<-1<<"\n";
            }
            else{
               fout<<y<<"\n";
            }
        }
        else if(op==1){
            fout<<cautbin1(x,n)<<"\n";
        }
        else if (op==2){
            fout<<cautbin2(x,n)<<"\n";
        }
    }
    return 0;
}