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Cod sursa(job #998483)
#include <fstream>
using namespace std;
int v[100005],n;
int din_min[18][100005];
//int din_max[18][50005];
int log2[100005];
int minim(int x,int y)
{
if(x<y)
return x;
return y;
}
/*
int maxim(int x,int y)
{
if(x>y)
return x;
return y;
}*/
void prep_log()
{
int i;
log2[1]=0;
for(i=2;i<=n;i++)
log2[i]=log2[i>>1]+1;
}
void prep()
{
int i,j,lung=log2[n];
for(i=1;i<=n;i++)
din_min[0][i]=v[i];//din_max[0][i]=v[i];
for(i=1;i<=lung;i++)
{
for(j=1;j<=n;j++)
{
if((j+((1<<i)-1))<=n)
{
din_min[i][j]=minim(din_min[i-1][j],din_min[i-1][j+(1<<(i-1))]);
// din_max[i][j]=maxim(din_max[i-1][j],din_max[i-1][j+(1<<(i-1))]);
}
}
}
}
int main()
{
ifstream cin("rmq.in");
ofstream cout("rmq.out");
int q,i,a,b,lung,mini,maxi;
cin>>n>>q;
prep_log();
//for(i=1;i<=n;i++)
// cout<<log2[i]<<' ';
for(i=1;i<=n;i++)
cin>>v[i];
prep();
for(i=0;i<q;i++)
{
cin>>a>>b;
lung=b-a+1;
lung=log2[lung];
mini=minim(din_min[lung][a],din_min[lung][b-(1<<lung)+1]);
//maxi=maxim(din_max[lung][a],din_max[lung][b-(1<<lung)+1]);
//cout<<maxi-mini<<'\n';
cout<<mini<<'\n';
}
cin.close();
cout.close();
return 0;
}