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Cod sursa(job #397030)
#include<fstream>
#include<vector>
using namespace std;
#define nn 100005
#define min(a,b) a<b?a:b
int rmq[18][nn];
int v[nn],lg[nn];
int m,n;
int main()
{
long int a,b,i,j,l;
ifstream fin("rmq.in");
fin>>n>>m;
for(i=1;i<=n;++i)
fin>>v[i];
lg[1]=0;
for (i=2;i<=n;i++)
lg[i]=lg[i/2]+1;
for (i=1;i<=n;i++)
rmq[0][i]=v[i];
for (i=1;(1<<i)<=n;i++)
for (j=1;j <= n - (1 << i)+1;j++)
{
l=1<<(i-1);
rmq[i][j]=min(rmq[i-1][j],rmq[i-1][j+l]);
}
long int diff,sh;
FILE *f=fopen("rmq.out","w");
for (i=1;i<=m;i++)
{
fin>>a>>b;
diff=b-a+1;
l=lg[diff];
sh=diff-(1<<l);
fprintf(f,"%d\n",min(rmq[l][a],rmq[l][a+sh]));
}
fin.close();
fclose(f);
return 0;
}