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Cod sursa(job #440341)
#include<stdio.h>
int v[100005],M[100005][20],n,m,i,x,y,j,lg[100005];
void process()
{
for(i=0;i<n;i++)
M[i][0]=i;
for(i=2;i<=n;i++)
lg[i]=lg[i/2]+1;
for(j=1;(1<<j)<=n;j++)
for(i=0;i+(1<<j)-1<n;i++)
if(v[M[i][j-1]]<=v[M[i+(1<<(j-1))][j-1]])
M[i][j]=M[i][j-1];
else M[i][j]=M[i+(1<<(j-1))][j-1];
}
int rmq(int i, int j)
{
int k=lg[j-i+1];
if(v[M[i][k]]<=v[M[j-(1<<k)+1][k]])
return v[M[i][k]];
return v[M[j-(1<<k)+1][k]];
}
int main()
{
freopen("rmq.in","r",stdin);
freopen("rmq.out","w",stdout);
scanf("%d %d",&n,&m);
for(i=0;i<n;i++)
scanf("%d",&v[i]);
process();
for(i=0;i<m;i++)
{
scanf("%d %d",&x,&y);
printf("%d\n",rmq(x-1,y-1));
}
return 0;
}