2017年noip提高组初赛阅读程序题：
#include <iostream>
usingnamespacestd;
int main() {
int n, i, j, x, y, nx, ny;
int a[40][40];
for (i = 0; i < 40; i++)
for (j = 0; j < 40; j++)
a[i][j] = 0;
cin >> n;
y = 0;
x = n - 1;
n = 2 * n - 1;
for (i = 1; i <= n * n; i++) {
a[y][x] = i;
ny = (y - 1 + n) % n;
nx = (x + 1) % n;
if ((y == 0 && x == n - 1) || a[ny][nx] != 0)
y = y + 1;
else {
y = ny; x = nx;
}
}
for (j = 0; j < n; j++)
cout << a[0][j] << " ";
cout << endl;
return0;
}输入：3
输出：_________