Cod sursa(job #2040699)

Utilizator Mihai_BarbuMihai Barbu Mihai_Barbu Data 16 octombrie 2017 11:23:24
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.2 kb
#include <bits/stdc++.h>
#define nmax 100002
using namespace std;

FILE*fin=fopen("cautbin.in","r");
ofstream fout("cautbin.out");

int n,m,v[nmax],c,x;

int cb0(int x)
{
    int st=1,dr=n,mij,pmax=-1;
    while(st<=dr)
    {
        mij=st+((dr-st)>>1);
        if(v[mij]>x) dr=mij-1;
        else if(v[mij]<x) st=mij+1;
        else
        {
            pmax=mij;
            st=mij+1;
        }
    }
    return pmax;
}

int cb1(int x)
{
    int st=1,dr=n,mij,pmax=-1;
    while(st<=dr)
    {
        mij=st+((dr-st)>>1);
        if(v[mij]<=x) pmax=mij, st=mij+1;
        else if(v[mij]>x) dr=mij-1;
    }
    return pmax;
}

int cb2(int x)
{
    int st=1,dr=n,mij,pmax=-1;
    while(st<=dr)
    {
        mij=st+((dr-st)>>1);
        if(v[mij]>=x) pmax=mij, dr=mij-1;
        else if(v[mij]<x) st=mij+1;
    }
    return pmax;
}

int main()
{
    fscanf(fin,"%d",&n);
    int i;
    for(i=1;i<=n;i++)
        fscanf(fin,"%d",&v[i]);
    fscanf(fin,"%d",&m);
    for(i=1;i<=m;i++)
    {
        fscanf(fin,"%d%d",&c,&x);
        if(c==0) fout<<cb0(x)<<'\n';
        else if(c==1) fout<<cb1(x)<<'\n';
        else fout<<cb2(x)<<'\n';
    }
    return 0;
}