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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4. 	int n,m;
  5. 	cin>>n>>m;
  6. 	vector<vector<int> > a(n,vector<int>(m,0));
  7.  
  8. 	int r=0,c=0,rr=n-1,cc=m;
  9. 	int d=1,i=0;
  10. 	while(d<=n*m){
  11. 		for( i=c;i<c+cc;i++)a[r][i]=d++;
  12. 		c=i-1;
  13. 		cc--;
  14. 		for(i =r+1;i<r+1+rr;i++)a[i][c]=d++;
  15. 		r = i-1;
  16. 		rr--;
  17. 		for( i = c-1;i>=c-cc;i--)a[r][i]=d++;
  18. 		c=i+1;
  19. 		cc--;
  20. 		for(i=r-1;i>=r-rr;i--)a[i][c]=d++;
  21. 		r = i+1;
  22. 		rr--;
  23. 		c=i+1;
  24. 	}
  25. 	for(int i=0;i<n;i++){
  26. 		for(int j=0;j<m;j++)
  27. 		cout<<a[i][j]<<" ";
  28. 		cout<<endl;
  29. 	}
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
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4 5
stdout
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1 2 3 4 5 
14 15 16 17 6 
13 20 19 18 7 
12 11 10 9 8
https://ideone.com/2kMbVp
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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