petyaGavrikov

Verified answer

#include <iostream>
using namespace std;

int main() {
int n=7;
int a[n][n];
for (int i=0; i<n/2; i++){
  for (int j=0; j<i; j++) a[i][j] = 0;
  for (int j=i; j<n-i; j++) a[i][j] = 1;
  for (int j=n-i; j<n; j++) a[i][j] = 0;
}
for (int i=n/2; i<n; i++){
  for (int j=0; j<n-i-1; j++) a[i][j] = 0;
  for (int j=n-i-1; j<i+1; j++) a[i][j] = 1;
  for (int j=i+1; j<n; j++) a[i][j] = 0;
}
for (int i=0; i<n; i++){
  for (int j=0; j<n; j++) cout << a[i][j];
  cout << "\n";
}
return 0;
}

Результат:
1111111
0111110
0011100
0001000
0011100
0111110
1111111