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  1. Prepare
  2. C++
  3. Introduction
  4. Variable Sized Arrays
  5. Discussions

Variable Sized Arrays

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  • vishnut0308
     + 0 comments
    #include <iostream>
#include <vector>
using namespace std;
//matrix problem  :X
int main() {
    int n, q;
    cin >> n >> q;
    vector<vector<int>> arr(n);

    for (int i = 0; i < n; i++) {
        int k; cin >> k;
        arr[i].resize(k);
        for (int j = 0; j < k; j++) cin >> arr[i][j];
    }

    while (q--) {
        int x, y; cin >> x >> y;
        cout << arr[x][y] << "\n";
    }
}

  • risavmandal2009
     + 0 comments

    My solution:

    include

    using namespace std;

    int main(){ ios::sync_with_stdio(0); cin.tie(0);

    int n, q;
cin >> n >> q;
vector<vector<int>> no(n);
for(int i = 0; i<n; i++){
    int k;
    cin >> k;
    no[i].resize(k);
    for(int j = 0; j<k; j++){
        cin >> no[i][j];
    }
}
while(q-->0){
    int x, y;
    cin >> x >> y;
    cout << no[x][y] << '\n';
}

return 0;

    }

    I am not that familiar with pointers actually, so I used vectors instead.

    return 0;

    }

  • iliussagar
     + 0 comments

    int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int n, q; cin >> n >> q; // number of arrays and number of queries

    vector<vector<int>> arr(n);

// input arrays
for (int i = 0; i < n; i++) {
    int k;
    cin >> k;   // size of this array
    arr[i].resize(k);
    for (int j = 0; j < k; j++) {
        cin >> arr[i][j];
    }
}

// answer queries
for (int i = 0; i < q; i++) {
    int M, N;
    cin >> M >> N;
    cout << arr[M][N] << endl;
}
return 0;

    }

  • ahmed_m_taha01
     + 0 comments
    

    cin >> n >> q;
int** arr = new int*[n];
for(unsigned int h = 0; h < n; ++h)
{
    cin >> k;
    *(arr + h) = new int[k];
    for(unsigned m = 0; m < k; ++m) {cin >> *(*(arr + h)+ m);}
}
for(unsigned int h = 0; h < q; h++){cin >>i >>j; cout << *(*(arr + i)+ j) << endl;}

  • londonbellmarcv1
     + 0 comments

    Here is my code

    include

    include

    include

    include

    include

    using namespace std;

    int main() {

    int n ;
cin >> n;
int q ;
cin >> q;
vector<vector<int>> arr(n);  

for (int i = 0; i < n; i++) {
    int k ;
    cin >> k;

    arr[i].resize(k);

    for (int j = 0; j < k; j++) {
        cin >> arr[i][j];
    }
}

for (int j = 0 ; j < q ; j++) {
    int x, y ;
    cin >> x >> y;
    cout << arr[x][y] << endl;
}
return 0;

    }