vector2D_1_input.cpp

#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<vector<int>> tab = {
        {42,  0,  0,  0,  0},
        { 0, 42,  0,  0,  0},
        { 0,  0, 42,  0,  0},
        { 0,  0,  0, 42,  0},
        { 0,  0,  0,  0, 42}
        };
    int j;
    cin >> j;
    if (0<=j and j<5)
        cout << tab[3][j] << endl;
}