Cod sursa(job #1167482)

Utilizator mirceadinoMircea Popoveniuc mirceadino Data 5 aprilie 2014 09:20:58
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.51 kb
#include<cstdio>
#include<algorithm>

using namespace std;

const int NMAX = 100000+5;

void Read(),Solve();

int N,M;
int V[NMAX];

int BS(int value)
{
    int left,right,middle,ans = -1;

    for(left = 1, right = N; left <= right; )
    {
        middle = (left + right)/2;
        if(V[middle] == value) ans = middle;
        if(V[middle] <= value) left = middle + 1;
        else right = middle - 1;
    }

    return ans;
}

int LB(int value)
{
    int left,right,middle,ans = -1;

    for(left = 1, right = N; left <= right; )
    {
        middle = (left + right)/2;
        if(V[middle] <= value) ans = max(ans, middle), left = middle + 1;
        else right = middle - 1;
    }

    return ans;
}

int UB(int value)
{
    int left,right,middle,ans = N+1;

    for(left = 1, right = N; left <= right; )
    {
        middle = (left + right)/2;
        if(V[middle] < value) left = middle + 1;
        else ans = min(ans, middle), right = middle - 1;
    }

    return ans;
}

int main()
{
    Read();
    Solve();

    return 0;
}

void Read()
{
    int i;

    freopen("cautbin.in","r",stdin);
    freopen("cautbin.out","w",stdout);

    scanf("%d",&N);

    for(i = 1; i <= N; i++)
        scanf("%d",&V[i]);

    scanf("%d",&M);
}

void Solve()
{
    int t,x;

    for(; M; --M)
    {
        scanf("%d%d",&t,&x);
        if(t==0) printf("%d\n",BS(x));
        else if(t==1) printf("%d\n",LB(x));
        else printf("%d\n",UB(x));
    }
}