#include <bits/stdc++.h>
#define INF 0x3f3f3f3f
using namespace std;
int square[34][34],n;
bool Outside(int i,int j){
	if((square[i-1][j]==INF || square[i+1][j]==INF ||
	   square[i][j-1]==INF || square[i][j+1]==INF)&&square[i][j]==0){
		return true;
	}
	return false;
}
void PeelOnion(int layer){
	   /*Union*/
	for(int i = layer;i <= n+1-layer;++i){
		if(Outside(layer,i))square[layer][i]=INF;
		if(Outside(n+1-layer,i))square[n+1-layer][i]=INF;
		if(Outside(i,layer))square[i][layer]=INF;
		if(Outside(i,n+1-layer))square[i][n+1-layer]=INF;
	}
		
}
int main(){
	cin >> n;
	memset(square,0x3f,sizeof(square));
	for(int i = 1;i <= n;++i)
		for(int j = 1;j <= n;++j)
			cin >> square[i][j]; 
	for(int i = 1;i <= n/2+1;++i){
		PeelOnion(i);
	}
	for(int i = 1;i <= n;++i){
		for(int j = 1;j <= n;++j){
			if(square[i][j]==INF)cout << "0 ";
			else if(square[i][j]==1)cout << "1 ";
			else if(square[i][j]==0)cout << "2 "; 
		}
		cout << endl;
	}
	return 0;
} 

这段代码会导致#4和#6WA掉，我查看了输入样例，我的程序会导致有的在外面的 $0$ 莫名其妙被算进里面。

我把 $28$ 行的n/2+1改成了n，没用。
我于是把 $28\sim30$ 行的代码重复了一遍，过了。

求大佬告诉我我的原先代码有什么问题