You are given N integer sequences and Q queries. Each query is in the following format: "a b" where a denotes the index of the sequence, and b denotes the index of the element in that sequence. Your task is to find the value of the element described in each query. Input Format The first line consists of N and Q separated by a space. The followin…

variable_sized_arrays.cpp

/*
2 2
3 1 5 4
5 1 2 8 9 3
0 1
1 3
*/
#include<iostream>
using namespace std;
int main() {
        int n /*integer sequences*/, q /*queries*/, _nsize = 0;
        int **sequences, **queries;
        cin >> n >> q;
        sequences = new int*[n]; //to store sequences
        queries = new int*[q]; //to store queries
        for(int sidx = 0; sidx < n; ++sidx) {
                cin >> _nsize;
                sequences[sidx] = new int[_nsize];
                for(int _idx = 0; _idx < _nsize; ++_idx) {
                        cin >> sequences[sidx][_idx];
                }
        }
        for(int qidx = 0; qidx < q; ++qidx) {
                queries[qidx] = new int[2];
                cin >> queries[qidx][0] >> queries[qidx][1];
        }
        for(int qidx = 0; qidx < q; ++qidx) {
                cout << sequences[queries[qidx][0]][queries[qidx][1]] << endl;
        }
        delete [] sequences;
        delete [] queries;
        return 0;
}

hello, I'm currently learning cpp and came across your code, I'm having trouble with increment before processing the current statement, can you explain "++_idx" the line, starting from the second FOR (line 19), thank you