Cod sursa(job #178874)

Utilizator hadesgamesTache Alexandru hadesgames Data 15 aprilie 2008 12:33:41
Problema Range minimum query Scor 70
Compilator cpp Status done
Runda Arhiva educationala Marime 0.84 kb
#include <stdio.h>
inline int  minc(int x,int y)
{
	if (x<y)
		return x;
	return y;
}
int a[100005][35],b[100005],log[100005],puteri[40];
int main()
{
	int n,m,i,j,x,put,y;
	FILE *in,*out;
	in=fopen("rmq.in","r");
	out=fopen("rmq.out","w");
	fscanf(in,"%d%d",&n,&m);
	for (i=1;i<=n;i++)
	{
		fscanf(in,"%d",&b[i]);
	}
	log[1]=0;
	x=1;
	put=0;
	puteri[0]=1;
	for (i=2;i<=100000;i++)
	{
		if (x*2<=i)
		{
			x*=2;
			put++;
			puteri[put]=x;
		}
		log[i]=put;
	}
	puteri[put+1]=x*2;
	for (i=n;i>=1;i--)
	{
		a[i][0]=b[i];
		printf("%d ",a[i][0]);
		for (j=1;i+puteri[j]<=n+1;j++)
		{
			a[i][j]=minc(a[i][j-1],a[i+puteri[j-1]][j-1]);
			printf("%d ",a[i][j]);
		}
		printf("\n");
	}
	for (i=1;i<=m;i++)
	{
		fscanf(in,"%d%d",&x,&y);
		fprintf(out,"%d\n",minc(a[x][log[y-x+1]],a[y-puteri[log[y-x+1]]+1][log[y-x+1]]));
	}
	fclose(in);
	fclose(out);
	return 0;
}