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

Variable Sized Arrays

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1480 Discussions

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  • tulendaccau098
     + 0 comments

    // meo meo :))

    include

    using namespace std;

    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 i, j;
    cin >> i >> j;
    cout << arr[i][j] << endl;
}

return 0;

    }

  • tecal96018
     + 1 comment

    only revise format and variable name with gpt written by CPP newbie

    #include <iostream>
#include <vector>

using namespace std;

int main() {
    int n;  // number of arrays
    int q;  // number of queries
    cin >> n >> q;

    // store variable-length arrays
    vector<vector<int>> arrays(n);

    for (int i = 0; i < n; i++) {
        int len;  // length of the i-th array
        cin >> len;

        arrays[i].resize(len);

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

    // process queries
    for (int k = 0; k < q; k++) {
        int arrayIndex;
        int elementIndex;
        cin >> arrayIndex >> elementIndex;

        cout << arrays[arrayIndex][elementIndex] << "\n";
    }

    return 0;
}

  • ranaprashant9572
     + 0 comments

    include

    include

    include

    include

    include

    using namespace std;

    int main() { int n,q; //n = lenght of main vector q = no. of queries cin >> n >> q;

    vector<vector<int>> VEC(n); //initializing the 2D vector VEC
for(int i = 0; i < n; i++){ //accessing each elements of the vector VEC
    int lenght; //lenght of each vector
    cin >> lenght;
    vector<int> ele(lenght);
    for(int j = 0; j < lenght; j++){ //writing the elements of each elements of the VEC
        cin >> ele[j];
    }
    VEC[i] = ele;
}

vector<vector<int>> queries(q); //accomodating the i j format in one vector in the form of vector itself
for(int s = 0; s < q; s++){
    vector<int> rank(2); //creating individual vector for each query
    for(int i = 0; i < 2; i++){
        cin >> rank[i];
    }
    queries[s] = rank;
}
for(int i = 0; i < q; i++){
    cout << VEC[queries[i][0]][queries[i][1]] << endl; //accessing the elements

}
return 0;

    }

  • bmitchell325
     + 1 comment
    #include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <sstream> 


using namespace std;


int main() {
    int n{};
    int q{};
    scanf("%d %d", &n , &q);
    std::vector<std::vector<int>> allVecs{};
    
    for (int arrs = 0 ; arrs < n ; arrs++) 
    {
        int tempArrLen{};
        scanf("%d", &tempArrLen);
        std::vector<int> tempArr{};
        int tempVal{};
        
        for (int i = 0; i < tempArrLen; i++) {
            scanf("%d", &tempVal);
            tempArr.push_back(tempVal);
        }
        allVecs.push_back(tempArr);
    }
    std::vector<pair<int,int>> queryVec{};
    std::vector<int> res{};
    
    for (int query = 0 ; query < q ; query++) {
        std::pair<int,int> temp{};
        scanf("%d %d", &temp.first, &temp.second);
        // queryVec.push_back(temp);
        std::vector<int> tempOuter{allVecs[temp.first]};
            
        res.push_back(tempOuter[temp.second]);    
    }
    
    for (auto x : res) {
        std::cout<<x<<std::endl;
    }
    
    return 0;
}

  • ajaykrishna14101
     + 0 comments
    #include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n,q;
    scanf("%d %d",&n,&q);
    std::vector<std::vector<int>> combinedVector;
    for(int ii = 0;ii<n;ii++)
    {
        int tempArrLen;
        scanf("%d",&tempArrLen);
        std::vector<int> arrTemp;
        int tempVal;
        for(int jj=0;jj<tempArrLen;jj++)
        {
            scanf("%d",&tempVal);
            arrTemp.push_back(tempVal);
        }
        combinedVector.push_back(arrTemp);
    }
    for(int xx=0;xx<q;xx++)
    {
        int arrNum, arrIdx;
        scanf("%d %d",&arrNum,&arrIdx);
        std::vector<int> arrTemp1;
        arrTemp1 = combinedVector.at(arrNum);
        cout << arrTemp1[arrIdx] << std::endl;
    }
    return 0;
}