Cod sursa(job #2374072)

Utilizator RK_05Ivancu Andreea Raluca RK_05 Data 7 martie 2019 16:48:50
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.22 kb
#include <fstream>
#include <iostream>
#define NMAX 100005

using namespace std;

//ifstream fin("date.in");
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");

int n, v[NMAX], q;

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

void read(){
    fin >> n;
    for(int i = 1; i <= n; ++i)
        fin >> v[i];
    fin >> q;
    for(int i = 1; i <= q; ++i){
        int c, x;
        fin >> c >> x;
        if(c == 0){
            int mij = cautare_binara(1, n, x);
            while(v[mij] == v[mij + 1])
                mij++;
            fout << mij << '\n';
        }
        if(c == 1){
            int mij = cautare_binara(1, n, x);
            while(v[mij] == v[mij + 1])
                mij++;
            fout << mij << '\n';
        }
        if(c == 2){
            int mij = cautare_binara(1, n, x);
            while(v[mij] == v[mij - 1])
                mij--;
            fout << mij << '\n';
        }
    }
}

int main(){

    read();
    fin.close();
    fout.close();
    return 0;
}