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Cod sursa(job #667159)
#include <iostream>
#include <stdio.h>
#include <cmath>
using namespace std;
#define NMAX 100005
#define MMAX 18
int N, M, A[NMAX], Min[NMAX][MMAX];
void preprocess()
{
// pt. intervale de 1 singur element
for (int i = 0; i < N; i++)
{
Min[i][0] = i;
}
// pt. intervalele de la 2 elemente in sus
for (int j = 1; 1 << j <= N; j++)
{
for (int i = 0; i + (1 << j) - 1 < N; i++)
{
if (A[Min[i][j - 1]] <= A[Min[i + (1 << (j - 1))][j - 1]])
{
Min[i][j] = Min[i][j - 1];
}
else
{
Min[i][j] = Min[i + (1 << (j - 1))][j - 1];
}
}
}
}
int query(int low, int high)
{
int k = (int)log2(high - low + 1);
// maximul dintre 2 intervale care acopera [low, high]
if (A[Min[low][k]] <= A[Min[high - (1 << k) + 1][k]])
{
return A[Min[low][k]];
}
else
{
return A[Min[high - (1 << k) + 1][k]];
}
}
void solve()
{
int low, high;
scanf("%d %d",&N,&M);
for (int i = 0; i < N; i++)
{
scanf("%d", &A[i]);
}
preprocess();
for (int i = 0; i < M; i++)
{
scanf("%d %d", &low, &high);
printf("%d\n", query(low - 1, high - 1));
}
}
int main()
{
freopen("rmq.in","r",stdin);
freopen("rmq.out","w",stdout);
solve();
return 0;
}