Variable Sized Arrays

Hackerrank/Variable Sized Arrays.cpp

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+/*https://www.hackerrank.com/challenges/variable-sized-arrays/problem*/
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+int main(){
+    int n, q;
+    cin >> n >> q;
+
+    // create vector of vectors
+    vector<vector<int>> a(n);
+
+    // fill each 2D vector i with k_i values
+    for (int i = 0; i < n; i++) {
+        // get the length k of the vector at a[i]
+        int k;
+        cin >> k;
+
+        // fill the vector with k values
+        a[i].resize(k);
+        for (int j = 0; j < k; j++) {
+            cin >> a[i][j];
+        }
+    }
+
+    // run queries on a
+    for (int q_num = 0; q_num < q; q_num++) {
+        // get i, j as the 'query' to get a value from a
+        int i, j;
+        cin >> i >> j;
+        cout << a[i][j] << endl;
+    }
+
+
+    return 0;
+}