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西北工业大学机试题:

1.调整方阵

A.调整方阵

 

2.合并符串

B.合并符串

 

3.求两个多项式的和

C.求两个多项式的和

 

4.杨辉三角形

D.杨辉三角形

 

AC代码：

1.调整方阵

# include <bits/stdc++.h>
using namespace std;
int a[20][20];
int n;
int change[15];

void swap_hang(int A,int B){
  int t[15];
  
  // t = A
  for (int i = 1; i <= n; ++i) t[i] = a[A][i];
  
  // A = B
  for (int i = 1; i <= n; ++i) a[A][i] = a[B][i];
  
  // B = t
  for (int i = 1; i <= n; ++i) a[B][i] = t[i];
}
int main (void){
  cin >> n;
  
  for (int i = 1; i <= n; ++i)
    for (int j = 1; j <= n; ++j)
      cin >> a[i][j];
  
  // 按照要求去模拟
  for (int i = 1; i <= n; ++i){
    // 记录最大数所在的行和他应该交换到的行
    int before_change;
    int val = -1e9;
    int after_change = i;
    
    for (int j = i; j <= n; ++j){
      if (a[j][i] > val){
        before_change = j;
        val = a[j][i];
      }
    }
    
    // 交换这两行
    swap_hang(before_chang...