I can not find on the Internet how to sort the first line of a two-dimensional array in ascending order, using the function sort () .

# include & lt; iostream & gt;
#Include & lt; algorithm & gt;
#Include & lt; Time.h & gt;
#Include & lt; stdlib.h & gt;
Using Namespace STD;
INT MAIN ()
{
  long n = 10;
  int A [n] [n];
  int i, j, sum = 0, k = 0;
  COUT & LT; & LT; "Enter the matrix \ n";
  for (i = 0; i & lt; n; i ++) {
    for (j = 0; j & lt; n; j ++) {
      A [i] [j] = rand ()% 10;
      COUT & LT; & LT; A [i] [j] & lt; & lt; "";}
    COUT & LT; & LT; Endl;
  }
  for (i = 0; i & lt; n; i ++)
    for (j = 0; j & lt; n; j ++) {
      if (i == j)
      {
        sum + = A [i] [i];
      }
    }
  cout & lt; & lt; Endl & lt; & lt; "Sum =" & lt; & lt; sum;
  Return 0;
}

Answer 1

# include & lt; iostream & gt;
#Include & lt; algorithm & gt;
#Include & lt; Time.h & gt;
#Include & lt; stdlib.h & gt;
Using Namespace STD;
INT MAIN ()
{
  long n = 10;
  int A [n] [n];
  int i, j, sum = 0, k = 0;
  COUT & LT; & LT; "Enter the matrix \ n";
  for (i = 0; i & lt; n; i ++) {
    for (j = 0; j & lt; n; j ++) {
      A [i] [j] = rand ()% 10;
      COUT & LT; & LT; A [i] [j] & lt; & lt; "";}
    COUT & LT; & LT; Endl;
  }
  sort (A [0], A [0] + n);
  cout & lt; & lt; "Sorted first line of a two-dimensional array: \ n";
  for (i = 0; i & lt; n; i ++)
   cout & lt; & lt; A [0] [i] & lt; & lt; ' ';
  Return 0;
}

Here we are in as a parameter to the function sort is a pointer to the first element of the first row, and at the end of the first line

Answer 2

sort (A [0], A [0] + n); in C++ can not specify the size of non-constant array variable. n must be const or constexpr