1027_打印沙漏

 java：

 1 import java.io.*;
 2 
 3 public class Main {
 4     static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
 5     static PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
 6     public static void main(String[] args) throws IOException {
 7         String[] s=in.readLine().split("\\s");
 8         int n=Integer.parseInt(s[0]);
 9         int l=1,r=23,mid=0;
10         while(l<r){
11             mid=(l+r+1)>>1;
12             if((mid<=1?1:1+2*(mid-1)*(mid+1))<=n) l=mid;
13             else r=mid-1;
14         }
15         int i=r,sum=2*r-1;
16         while(i>0){
17             for(int m=0; m<(sum-(2*i-1))>>1; m++) out.print(' ');
18             for(int j=1; j<=2*i-1; j++) out.print(s[1]);
19             i--;
20             out.println();
21         }
22         
23         i=2;
24         while(i<=r){
25             for(int m=0; m<(sum-(2*i-1))/2; m++) out.print(' ');
26             for(int j=1; j<=2*i-1; j++) out.print(s[1]);
27             i++;
28             out.println();
29         }
30         out.println(n-(r<=1?1:1+2*(r-1)*(r+1)));
31         out.flush();
32     }
33
34 }

 python：

import sys


def total(x):
    return 1 + 2 * (x - 1) * (x + 1)


def item(x):
    return 2 * x - 1


n, s = map(str, sys.stdin.readline().split())
n = int(n)
l, r, mid = 1, 23, 0
while l < r:
    mid = (l + r + 1) // 2
    if total(mid) <= n:
        l = mid
    else:
        r = mid - 1
i, num = r, item(r)
while i > 0:
    print((num - item(i)) // 2 * ' ', end='')
    print(item(i) * s)
    i -= 1
i = 2
while i <= r:
    print((num - item(i)) // 2 * ' ', end='')
    print(item(i) * s)
    i += 1
print(n - total(r))