AcWing每日一题--蛇形矩阵

https://www.acwing.com/problem/content/758/

模拟题

 1 #include<iostream>
 2 using namespace std;
 3 const int N=110;
 4 int a[N][N];
 5 int u[]={-1,0,1,0};
 6 int v[]={0,1,0,-1};
 7 int main(void){
 8     int n,m;
 9     cin>>n>>m;
10     int x=0,y=0,d=1;
11     for(int i=1;i<=n*m;i++){
12         a[x][y]=i;
13         int tx=x+u[d];
14         int ty=y+v[d];
15         if(tx<0||tx>=n||ty<0||ty>=m||a[tx][ty]){
16             d=(d+1)%4;
17             tx=x+u[d];
18             ty=y+v[d];
19         }
20         x=tx,y=ty;
21     }
22     for(int i=0;i<n;i++){
23         for(int j=0;j<m;j++){
24             cout<<a[i][j]<<" ";      
25         }
26         cout<<endl;
27     }
28     return 0;
29 }