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Cod sursa(job #609181)
#include <fstream>
using namespace std;
ifstream f("rmq.in");
ofstream g("rmq.out");
int i,mi,n,a[100002],m[18][100002],j,x,y,lg[100002];
int main() {
f >> n >> mi;
for (i=1;i<=n;i++) {
f >> a[i];
m[0][i]=a[i];
}
lg[1]=0;
for (i=2;i<=n;i++) lg[i]=lg[i/2]+1;
for (j=1;(1<<j)<=n;j++) {
for (i = 1; i + (1 << j) - 1 <= n; i++)
if (m[j-1][i] < m[j-1][i + (1 << (j - 1))])
m[j][i] = m[j-1][i];
else
m[j][i] = m[j-1][i + (1 << (j - 1))];
}
int k;
for (i=1;i<=mi;i++) {
f >> x >> y;
k=lg[y-x+1];
if (m[k][x]<=m[k][y-(1<<k)+1])
g << m[k][x] << '\n';
else
g << m[k][y-(1<<k)+1] << '\n';
}
f.close();g.close();
return 0;
}