Verified answer

#include <iostream>

#include <vector>

#include <cstdlib>

using namespace std;

void a(vector<vector<int>> arr) {

unsigned long long int min = 18446744073709551615;

for(int i = 0; i<arr[4].size(); ++i) {

 if(arr[4][0]<min) {

  min = arr[4][0];

 }

}

cout << endl << "Min: " << min;

}

void b(vector<vector<int>> arr, int x, int y) {

int max = -1;

for(int i = 0; i<x; ++i) {

 if(arr[i][3]>max) {

  max = arr[i][3];

 }

}

cout << endl << "max: " << max;

}

int main() {

srand(123);

cout << "Array x*y. Enter x: ";

int x = 0;

cin >> x;

cout << "Enter y: ";

int y = 0;

cin >> y;

if(x<5||y<4) {

 cout << "Wrong data. x<5 or y<4";

 return 0;

}

vector<vector<int>> arr;

for(int i = 0; i<x; ++i) {

 vector<int> temp;

 temp.push_back(rand());

 arr.push_back(temp);

 for(int j = 0; j<y; ++j) {

  arr[i].push_back(rand());

 }

}

for(int i = 0; i<x; ++i) {

 for(int j = 0; j<x; ++j) {

  cout << arr[i][j] << " ";

  if(j==x-1) {

   cout << endl;

  }

 }

}

a(arr);

b(arr, x, y);

}