e......不行啊

#include<iostream>
using namespace std;
int main(){
	int n,flag = 0,now = 1;
	cin >> n;
    int ans[n][n];
	int x = 1,y = 1;
	while(now <= n * (n + 1) / 2){
		ans[x][y] = now,ans[n-x+1][n-y+1] = n*n - now+1;
		now++;
		if(x == 1 && !flag){
            y++,flag=!flag;
        }else if(y==1 && flag){
            x++,flag=!flag;
        }else{
			if(flag){
                x++,y--;
            }else{
                x--,y++;
            }
		}
	} 
	for(int i = 1 ; i <= n ; i++){
		for(int j = 1 ; j <= n ; j++){
			cout << int(ans[i][j]);
            if(j <= n-1){
                cout << " ";
            }
		}
		cout << endl;
	}
}