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  1. #include <iostream>
  2. #include <vector>
  3. #include <stdlib.h>
  4.  
  5. using namespace std;
  6.  
  7. void initialize_matrix(vector< vector<int> > &a, int m, int n)
  8. {
  9.   int i, j;
  10.  
  11.   // make sure the matrix has the given number of rows,
  12.   // and that each row has the right number of elements
  13.   // one for each column; number of rows is m, number of
  14.   // columns is n
  15.  
  16.   a.resize(m);
  17.  
  18.   for (i=0; i<m; i++)
  19.     a[i].resize(n);
  20.  
  21.   // generate the matrix
  22.  
  23.   for (i=0; i<m; i++)
  24.     for (j=0; j<n; j++)
  25.       a[i][j] = drand48()*101; // random integer from 0 to 100
  26. }
  27.  
  28. void print_matrix(vector< vector<int> > &a)
  29. {
  30.   int i, j;
  31.   int m = a.size();
  32.   int n = a[0].size();
  33.  
  34.   for (i=0; i<m; i++)
  35.     {
  36.       for (j=0; j<n; j++)
  37. 	cout << a[i][j] << " ";
  38.       cout << endl;
  39.     }
  40. }
  41.  
  42. int main()
  43. {
  44.   int m, n;
  45.   vector< vector<int> > a;
  46.  
  47.   // read matrix size from input
  48.  
  49.   cin >> m;
  50.   cin >> n;
  51.  
  52.   // set random seed
  53.  
  54.   srand48(123);
  55.  
  56.   // initialize the matrix
  57.  
  58.   initialize_matrix(a, m, n);
  59.  
  60.  
  61.   // print the matrix
  62.  
  63.   print_matrix(a);
  64.  
  65.   // return 0 from main
  66.  
  67.   return 0;
  68. }
  69.  
Success #stdin #stdout 0.01s 2864KB
comments (?)
stdin
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6 3
stdout
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28 41 93 
13 12 35 
63 84 70 
15 78 37 
94 14 85 
12 82 39
https://ideone.com/QgIAN
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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