蒟蒻在线发问，请求各位大佬帮帮忙

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;
}