Cod sursa(job #1766701)

Utilizator vladbatalanBatalan Vlad vladbatalan Data 28 septembrie 2016 13:50:27
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.36 kb
#include <fstream>

using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");

int v[100100],N,M,Q,X;
inline void solve0(){
    int st=1, dr=N, mi;
    while(st<=dr)
    {
        mi=(st+dr)/2;
        if(v[mi]<=X)
            st=mi+1;
        else
            dr=mi-1;
    }
    mi=(st+dr)/2;
    if(v[mi]>X && mi>1)
        --mi;
    if(v[mi]==X)
        fout<<mi<<'\n';
    else
        fout<<-1<<'\n';

}
inline void solve1(){
    int st=1, dr=N, mi;
    while(st<=dr)
    {
        mi=(st+dr)/2;
        if(v[X]<=X)
            st=mi+1;
        else
            dr=mi-1;
    }
    mi=(st+dr)/2;
    if(v[mi]>X && mi>1)
        --mi;
    if(v[mi]<=X)
        fout<<mi<<'\n';
    else
        fout<<-1<<'\n';
}
inline void solve2(){
    int st=1, dr=N, mi;
    while(st<=dr)
    {
        mi=(st+dr)/2;
        if(v[mi]>=X)
            dr=mi-1;
        else
            st=mi+1;
    }
    mi=(st+dr)/2;
    if(v[mi]<X && mi<N)
        mi++;
    if(v[mi]>=X)
        fout<<mi<<'\n';
    else
        fout<<-1<<'\n';
}
int main()
{
    fin>>N;
    for(int i=1;i<=N;i++)
        fin>>v[i];
    fin>>M;
    for(int i=1;i<=M;i++)
    {
        fin>>Q>>X;
        if(Q==0)
            solve0();
        if(Q==1)
            solve1();
        if(Q==2)
            solve2();
    }
    return 0;
}