Cod sursa(job #226483)

Utilizator k_ounu_eddyIacob Eduard k_ounu_eddy Data 1 decembrie 2008 20:36:43
Problema Range minimum query Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 1.28 kb
#include<stdio.h>

int N,T,*lg;
//int **matrice;
int matrice[18][100002];
FILE *p;

void pregateste()
{
p=fopen("rmq.in","r");
fscanf(p,"%d",&N);
fscanf(p,"%d",&T);

lg=new int[N+1];
lg[1]=0;

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

//matrice=new int*[lg[N]+1];
//for(int i=0;i<=lg[N];i++)
//  matrice[i]=new int[N+1];

for(int i=1;i<=N;i++)
  fscanf(p,"%d",matrice[0]+i);
}

//int minim(int a,int b)
//{
//if(a>b)
//  return b;
//else
//  return a;
//}

void rezolva()
{
for(int i=1;i<=lg[N];i++)
  for(int j=1;j<=N-(i<<1)+1;j++)
    {int aux=1<<(i-1);
    
    if(matrice[i-1][j]<matrice[i-1][j+aux])
      matrice[i][j]=matrice[i-1][j];
    else
      matrice[i][j]=matrice[i-1][j+aux];
    }

FILE *pout=fopen("rmq.out","w");

for(int i=1;i<=T;i++)
  {
  int x,y;
  fscanf(p,"%d",&x);
  fscanf(p,"%d",&y);
  int diff=y-x+1;
  int aux=lg[diff];
  int aux2=diff-(1<<aux);
  int min;
  if(matrice[aux][x]<matrice[aux][x+aux2])
    min=matrice[aux][x];
  else
    min=matrice[aux][x+aux2];
  fprintf(pout,"%d\n",min);
  }
fclose(pout);
fclose(p);
}

void finalizeaza()
{//for(int i=0;i<=lg[N];i++)
//  delete []matrice[i];
//delete []matrice;
delete []lg;}

int main()
{
pregateste();
rezolva();
finalizeaza();
return 0;
}