我不知道哪里错了，大佬们可以帮我看看吗？

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[35][35],n,z = 0;
	cin>>n;
	for(int i = 1;i <= n;i++){
		for(int j = 1;j <= n;j++){
			cin>>a[i][j];
		}
	}
	for(int i = 1;i <= n;i++){
		for(int j = 1;j <= n;j++){
			if((a[i][j]==1&&a[i+1][j+1]!=1)||(a[i][j]==2&&a[i+1][j+1]!=1)){
				a[i+1][j+1] = 2;
				if(a[i][j+1] == 0&&a[i+1][j+1]==1||2){
					a[i][j+1] == 2;
				}
			}
			if((a[i+1][j]==1||2)||(a[i][j+1]==1||2)){
				a[i][j] == 2;
			} 
		}
	}
	for(int i = 1;i <= n;i++){
		for(int j = 1;j <= n;j++){
			cout<<a[i][j]<<" ";
		}
		cout<<endl;
	}


	return 0;
}