H3 added

H3.cpp

@@ -0,0 +1,79 @@
+#include <iostream>
+#include <vector>
+#include <cmath>
+
+using std::cin;
+using std::cout;
+using std::vector;
+using std::pair;
+
+class RMQ {
+ public:
+  explicit RMQ(vector<int> a) {
+    int count_lines = int(ceil(log2(a.size())));
+    int count_elements = a.size();
+
+    sparse_table.resize(count_lines, vector<pair<int, int>>(count_elements));
+
+    for (int i = 0; i < count_elements; i++) {
+      sparse_table[0][i] = {a[i], a[i]};
+    }
+
+    for (int i = 1; i < count_lines; i++) {
+      for (int j = 0; j < count_elements - (1 << i) + 1; ++j) {
+        sparse_table[i][j] = GetPairsStats(sparse_table[i - 1][j], sparse_table[i - 1][j + (1 << (i - 1))]);
+      }
+    }
+  }
+
+  int GetSecondStat(int left, int right) {
+    int number = int(ceil(log2(right - left + 1)));
+
+    return GetPairsStats(sparse_table[number - 1][left],
+                         sparse_table[number - 1][right - (1 << (number - 1)) + 1]).second;
+  }
+  ~RMQ(){
+    sparse_table.clear();
+  }
+ private:
+
+  static pair<int, int> GetPairsStats(pair<int, int> pair1, pair<int, int> pair2) {
+    vector<int> values{pair1.first, pair1.second, pair2.first, pair2.second};
+    int stat1 = 1e9, stat2 = 1e9;
+
+    for (int i = 0; i < values.size(); i++) {
+      if (values[i] < stat1) {
+        stat1 = values[i];
+      }
+    }
+    for (int i = 0; i < values.size(); i++) {
+      if (values[i] < stat2 && values[i] != stat1) {
+        stat2 = values[i];
+      }
+    }
+
+    return {stat1, stat2};
+  }
+
+  vector<vector<pair<int, int>>> sparse_table;
+};
+
+int main() {
+  int N, M;
+  cin >> N >> M;
+
+  vector<int> input(N);
+  for (int i = 0; i < N; i++) {
+    cin >> input[i];
+  }
+
+  RMQ rmq(input);
+
+  for (int i = 0; i < M; ++i) {
+    int left, right;
+    cin >> left >> right;
+    left--;
+    right--;
+    cout << rmq.GetSecondStat(left, right) << "\n";
+  }
+}