Cod sursa(job #1881004)

Utilizator jason2013Andronache Riccardo jason2013 Data 16 februarie 2017 08:48:04
Problema Cautare binara Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 1.87 kb
#include<bits/stdc++.h>
using namespace std;

FILE *in = fopen("cautbin.in", "r");
FILE *out = fopen("cautbin.out", "w");

const int nmax = 1e5 + 5;
int n, m, a[nmax];

inline int first(int el)
{
    int left = 1, right = n, mij;
    bool gasit = false;
    while(left <= right && !gasit)
    {
        mij = (left + right)/2;
        if(a[mij] == el)
            gasit = true;
        else
        {
            if(a[mij] < el)
                right = mij - 1;
            else left = mij + 1;
        }
    }

    if(!gasit)
        return -1;
    while(a[mij] == el && mij <= n)
        ++mij;
    return mij-1;
}

inline int second(int y)
{
    int left = 1, right = n, mij;
    while(left < right)
    {
        mij = (left + right) / 2;
        if( a[mij] <= y )
            left = mij + 1;
        else
            right = mij;
    }

    mij = ( right + left ) / 2;
    while(a[mij] > y) --mij;
    return mij;
}

inline int third(int y)
{
    int left, right, mij;
    left = 1; right = n;
    while(left < right)
    {
        int mij = ( left + right ) / 2;
        if(a[mij] < y)
            left = mij + 1;
        else right = mij;
    }
    mij = (right + left) / 2;
    while(a[mij] < y) ++ mij;
    return mij;
}

void read()
{
    int operation = 0;
    fscanf(in, "%d", &n);
    for(int i = 1; i <= n; i++)
        fscanf(in, "%d", &a[i]);
    fscanf(in, "%d", &m);
    for(int i = 1; i <= m; i++)
    {
        int y;
        fscanf(in, "%d%d", &operation, &y);
        if(operation == 0)
        {
            fprintf(out, "%d\n", first(y));
        }
        else if( operation == 1 )
        {
            fprintf(out, "%d\n", second(y));
        }
        else if( operation == 2 )
        {
            fprintf(out, "%d\n", third(y));
        }
    }
}

int main()
{
    read();
    return 0;
}