Cod sursa(job #2334571)

Utilizator danruicuDan Ruicu danruicu Data 2 februarie 2019 18:26:22
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.33 kb
#include <bits/stdc++.h>
using namespace std;
ifstream in ("cautbin.in");
ofstream out ("cautbin.out");



int v[100001];
int cbin0(int x,int l)
{
    int pos=0,msk;
    v[0]=-1;
    for(int msk=1<<20;msk>=1;msk=msk>>1)
        if(pos+msk<=l && v[pos+msk]<=x)
            pos+=msk;
    if(v[pos]==x)
    {
        return pos;
    }
    else
    {
        return-1;
    }
}
int cbin1(int x,int l)
{
    v[0]=-1;
    int pos=0,msk;
    for(int msk=1<<20;msk>=1;msk=msk>>1)
        if(pos+msk<=l && v[pos+msk]<=x)
            pos+=msk;
    while(v[pos]>x)
    {
        pos--;
    }
    return pos;
}
int cbin2(int x,int l)
{
    v[0]=-1;
    int pos=0,msk;
    for(int msk=1<<20;msk>=1;msk=msk>>1)
        if(pos+msk<=l && v[pos+msk]<=x)
            pos+=msk;
    while(v[pos]==x)
    {
        pos--;
    }
    while(v[pos]<x)
    {
        pos++;
    }
    return pos;
}

int main()
{
    int M,i,k,x,n;
    in>>n;
    for(i=1;i<=n;i++)
    {
        in>>v[i];
    }
    sort(v+1,v+n+1);
    in>>M;
    while(M--)
    {
        in>>k>>x;
        if(k==0)
        {
            out<<cbin0(x,n)<<'\n';
        }
        if(k==1)
        {
            out<<cbin1(x,n)<<'\n';
        }
        if(k==2)
        {
            out<<cbin2(x,n)<<'\n';
        }
    }
    return 0;
}