Cod sursa(job #2777092)

Utilizator sandu_stefanSandu Stefan sandu_stefan Data 22 septembrie 2021 09:25:31
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <iostream>
#include <fstream>

using namespace std;
const int NMAX=100000;
int n,m,v[NMAX+1];

ifstream f("cautbin.in");
ofstream g("cautbin.out");

int caut0(int x){
    int p,u,poz;
    p=1;
    u=n;
    poz=-1;
    while (p<=u){
        m=(p+u)/2;
        if (x==v[m]){
            poz=m;
        }
        if (x>=v[m]){
            p=m+1;
        }
        else {
            u=m-1;
        }
    }
    return poz;
}
int caut1(int x){
    int p,u,poz;
    p=1;
    u=n;
    poz=-1;
    while (p<=u){
        m=(p+u)/2;
        if (x>=v[m]){
            poz=m;
            p=m+1;
        }
        else {
            u=m-1;
        }
    }
    return poz;
}
int caut2(int x){
    int p,u,poz;
    p=1;
    u=n;
    poz=-1;
    while (p<=u){
        m=(p+u)/2;
        if (x<=v[m]){
            poz=m;
            u=m-1;
        }
        else {
            p=m+1;
        }
    }
    return poz;
}

int main()
{
    int m,x,t;
    f>>n;
    for (int i=1;i<=n;i++){
        f>>v[i];
    }
    f>>m;
    while (m--){
        f>>t>>x;
        switch(t){
            case 0:
                g<<caut0(x)<<"\n";
                break;
            case 1:
                g<<caut1(x)<<"\n";
                break;
            case 2:
                g<<caut2(x)<<"\n";
        }
    }
    return 0;
}