Cod sursa(job #713994)

Utilizator swim406Teudan Adina swim406 Data 15 martie 2012 11:14:45
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.16 kb
#include<fstream>
using namespace std; 
int v[100001],n;
int val(int x) {
	int min,max,mid;
	min=1;
	max=n;
	if(n==0) return -1;
	else
		do {
			mid=min/2+max/2;
			if(x>v[mid])
				min=mid+1;
			else
				max=mid-1;
		}
		while(v[mid]!=x&&min>max);
		if(v[mid]==x) {
			while(v[mid]==x) mid++;
			return mid-1;
		}
		else return v[mid];
}
int pozmax(int x) {
	int min,max,mid;
	min=1;
	max=n;
		do {
			mid=min/2+max/2;
			if(x<v[mid])
				min=mid+1;
			else
				max=mid-1;
		}
		while(v[mid]!=x&&min>max);
		if(v[mid]==x) {
			while(v[mid]==x) mid++;
			return mid-1;
		}
		else return v[mid];
}
int pozmin(int x) {
	int min,max,mid;
	min=1;
	max=n;
		do {
			mid=min/2+max/2;
			if(x>v[mid])
				min=mid+1;
			else
				max=mid-1;
		}
		while(v[mid]!=x&&min>max);
		if(v[mid]==x) {
			while(v[mid]==x) mid--;
			return mid+1;
		}
		else return v[mid];
}
int main() {
	ifstream f("cautbin.in");
	ofstream g("cautbin.out");
	int m,i,x,y;
	f>>n;
	for(i=1;i<=n;i++) f>>v[i];
	f>>m;
	for(i=1;i<=m;i++) {
		f>>x>>y;
		if(x==0) g<<val(y)<<endl;
		if(x==1) g<<pozmax(y)<<endl;
		if(x==2) g<<pozmin(y);
	}
	return 0;
}