Cod sursa(job #303773)

Utilizator hurrycaneBogdan Gaza hurrycane Data 10 aprilie 2009 13:03:25
Problema Range minimum query Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.63 kb
#include<cstdio>

int N;
int M;
int a[100];
int lg[100];
int rmq[100][100];

int getmin(int x,int y){
	if(x<y) return x;
	return y;
}

int main(){
	int i,j,l;
	freopen("rmq.in","r",stdin);
	freopen("rmq.out","w",stdout);

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

	for(i=1;i<=N;i++){
		scanf("%d",&a[i]);
		rmq[0][i]=a[i];
	}

	lg[1]=0;

	for(i=2;i<=N;i++){
		lg[i]=lg[i/2]+1;
	}

	for(i=1;(1<<i)<=N;i++){
		for(j=1;j<=N-(1<<i)+1;j++){
			l=1<<(i-1);
			rmq[i][j]=getmin(rmq[i-1][j],rmq[i-1][j+l]);
		}
	}
	int x,y,t,u,v;
	for(i=1;i<=M;i++){
		scanf("%d %d",&x,&y);
		u=y-x+1;
		v=lg[u];
		t=u-(1<<v);
		printf("%d \n",getmin(rmq[v][x],rmq[v][x+t]));
	}

	return 0;
}