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- #include <iostream>
- #include <set>
- using namespace std;
- const int maxn = 200005;
- const int INF = 2e9;
- int n, a[maxn];
- int segment_tree[3 * maxn];
- int merge_nodes(int A, int B) {
- return min(A, B);
- }
- void build_tree(int L = 0, int R = n - 1, int node = 1) {
- if(L == R) {
- segment_tree[node] = a[L];
- }
- else {
- int middle = (L + R) / 2;
- build_tree(L, middle, 2 * node);
- build_tree(middle + 1, R, 2 * node + 1);
- segment_tree[node] = merge_nodes(segment_tree[2 * node], segment_tree[2 * node + 1]);
- }
- }
- int query(int i, int j, int L = 0, int R = n - 1, int node = 1) {
- if(R < i or j < L) {
- return INF;
- }
- if(i <= L and R <= j) {
- return segment_tree[node];
- }
- int middle = (L + R) / 2;
- int left_side = query(i, j, L, middle, 2 * node);
- int right_side = query(i, j, middle + 1, R, 2 * node + 1);
- return merge_nodes(left_side, right_side);
- }
- int main() {
- ios_base::sync_with_stdio(false);
- int q;
- cin >> n >> q;
- for(int i = 0; i < n; i++) {
- cin >> a[i];
- }
- build_tree();
- for(int i = 0; i < q; i++) {
- int a, b;
- cin >> a >> b;
- a--; b--;
- cout << query(a, b) << endl;
- }
- return 0;
- }
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