20103 回型矩阵

题目描述

给你一个整数n，按要求输出n∗n的回型矩阵

输入一行，包含一个整数n

1<=n<=19

输出n行，每行包含n个正整数.

样例输入

4

1 2 3 4
12 13 14 5
11 16 15 6
10 9 8 7

[二维数组]

C++题解代码

#include <bits/stdc++.h>
using namespace std;

int a[20][20];
int b;
int c;
int d;
int e;
int f;


void fn(int x, int y, int z) {
  for (int i = 1; i < z; i++) {
    a[x][y] = c;
    y++;
    c++;
  }
  for (int i = 1; i < z; i++) {
    a[x][y] = c;
    x++;
    c++;
  }
  for (int i = 1; i < z; i++) {
    a[x][y] = c;
    y--;
    c++;
  }
  for (int i = 1; i < z; i++) {
    a[x][y] = c;
    x--;
    c++;
  }
}

int main() {
  cin>>b;
  c = 1;
  d = b;
  e = 1;
  f = 1;
  while (d > 1) {
    fn(e, f, d);
    d -= 2;
    e++;
    f++;
  }
  if (d == 1) {
    a[e][f] = c;
  }
  for (int i = 1; i <= b; i++) {
    for (int j = 1; j <= b; j++) {
      cout<<a[i][j];
      if (j != b) {
        cout<<" ";
      }
    }
    if (i != b) {
      cout<<'\n';
    }
  }
  return 0;
}

Blockly题解代码图片