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Cod sursa(job #650275)
#include<stdio.h>
long int minim(long int a,long b)
{
if(a<b)
return a;
return b;
}
long int v[10001][20];
long int lg[100001];
int main()
{
FILE *fin,*fout;
fin=fopen("rmq.in","r");
fout=fopen("rmq.out","w");
long int x,y,i,m,n,j,k;
fscanf(fin,"%ld%ld",&n,&m);
for(i=1;i<=n;i++)
fscanf(fin,"%ld",&v[0][i]);
for(i=1;(1<<i)<=n;i++)
for(j=1;j<=n-(1<<i)+1;j++)
{
v[i][j]=minim(v[i-1][j],v[i-1][j+(1<<(i-1))]);
}
lg[1]=0;
for(i=2;i<=n;i++)
lg[i]=lg[i/2]+1;
for(i=1;i<=m;i++)
{
fscanf(fin,"%ld%ld",&x,&y);
k=lg[y-x+1];
fprintf(fout,"%ld\n",minim(v[k][x],v[k][y+1-(1<<k)]));
}
fclose(fout);
fclose(fin);
return 0;
}