#include <iostream>
using namespace std;
int main() {
int sz = 10; //actual size is 2*sz - 1
for (int i = 0; i < 2*sz - 1; ++i) {
for (int j = 0; j < 2*sz - 1; ++j) {
cout << (i >= sz - 1 && j >= i - sz + 1 && j <= 3*sz - 3 - i) << ' ';
}
cout << endl;
}
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKaW50IG1haW4oKSB7CglpbnQgc3ogPSAxMDsgLy9hY3R1YWwgc2l6ZSBpcyAyKnN6IC0gMQoJZm9yIChpbnQgaSA9IDA7IGkgPCAyKnN6IC0gMTsgKytpKSB7CgkJZm9yIChpbnQgaiA9IDA7IGogPCAyKnN6IC0gMTsgKytqKSB7CgkJCWNvdXQgPDwgKGkgPj0gc3ogLSAxICYmIGogPj0gaSAtIHN6ICsgMSAmJiBqIDw9IDMqc3ogLSAzIC0gaSkgPDwgJyAnOwoJCX0KCQljb3V0IDw8IGVuZGw7Cgl9CglyZXR1cm4gMDsKfQ==