Cod sursa(job #582975)
#include <cstdio>
#define Nmax 100001
using namespace std;
int a[Nmax];
int r[25][Nmax];
int n, m;
int x, y;
int log[Nmax];
inline int min(int, int);
void process();
int main() {
freopen("rmq.in", "r", stdin);
freopen("rmq.out", "w", stdout);
scanf("%d %d", &n, &m);
for(int i = 1; i <= n; i++)
scanf("%d ", &a[i]);
process();
for (int i = 2; i <= n; i++) {
log[i] = log[i / 2] + 1;
}
for (int i = 1; i <= m; i++) {
scanf("%d %d", &x, &y);
int l = log[y - x + 1];
printf("%d\n", min(r[l][x], r[l][y - l]));
}
return 0;
}
inline int min(int a, int b) {
return a < b ? a : b;
}
void process() {
for (int i = 1; i <= n; i++)
r[0][i] = a[i];
for (int i = 1; (1 << i) < n; i++)
for (int j = 1; j <= n - (1 << i) + 1; j++)
r[i][j] = min(r[i-1][j], r[i-1][j + (1 << (i - 1))]);
}