Cod sursa(job #2846173)

Utilizator Schweppesnick gurr Schweppes Data 8 februarie 2022 21:17:35
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.13 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int lowerb(int a[],int x, int n){
    int st=1,dr=n,ans;
    int mij;
    while(st<=dr){
        mij=(st+dr)/2;
        if(a[mij]<=x)ans=mij,st=mij+1;
        else dr=mij-1;
    }
    return ans;
}
int upperb(int a[],int x, int n ){
    int st=1,dr=n,ans;
    int mij;
    while(st<=dr){
        mij=(st+dr)/2;
        if(x<=a[mij]) dr=mij-1,ans=mij;
        else st=mij+1;
    }
    return ans;
}
int main(){
    int n,query,a[100005],cerr,x,st,dr,mij,poz;
    fin >> n;
    for(int i=1;i<=n;i++)fin>>a[i];
    fin>>query;
    for( ;query ;query--){
        fin >> cerr >> x;
        if(cerr==0){
            st=1,dr=n,poz=-1;
            while(st<=dr){
                mij=(st+dr)/2;
                if(a[mij]<=x)poz=mij,st=mij+1;
                else dr=mij-1;
            }
            if(poz==-1)fout<<-1<<'\n';
            else fout << poz << '\n';
        }
        else if(cerr==1){
            fout<<lowerb(a,x,n)<<'\n';
        }
        else fout << upperb(a,x,n) << '\n';
    }
    return 0;
}