Cod sursa(job #2883265)

Utilizator andreea0146Nicula Andreea andreea0146 Data 1 aprilie 2022 13:00:42
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.21 kb
#include<bits/stdc++.h>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int n,v[100002];

int caut_bin_0(int x)
{
    int st=1,dr=n,mij,sol=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(v[mij]==x)
        {
            sol=mij;
            st=mij+1;
        }
        else
        if(v[mij]<x)
            st=mij+1;
        else
        if(v[mij]>x)
            dr=mij-1;
    }
    return sol;
}

int caut_bin_1(int x)
{
    int st=1,dr=n,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(v[mij]<=x)
            st=mij+1;
        else
            dr=mij-1;
    }
    return st-1;
}

int caut_bin_2(int x)
{
    int st=1,dr=n,mij;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(v[mij]>=x)
            dr=mij-1;
        else
            st=mij+1;
    }
    return dr+1;
}

int main()
{
    int m,i,t,x;
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>t>>x;
        if(t==0)
            g<<caut_bin_0(x)<<'\n';
        else
        if(t==1)
            g<<caut_bin_1(x)<<'\n';
        else
            g<<caut_bin_2(x)<<'\n';
    }
    return 0;
}