varianta bac iasi 2020 v1

III.
1.
#include <bits/stdc++.h>

using namespace std;

int main()
{int a[101][101],n,i,j,m,i1=2e9,i2=2e-9,j1=2e9,j2=2e-9,c=0,k,ok=1,ok1=1;
cin>>n;
for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
    {cin>>a[i][j];
    if(a[i][j]==0)
        {c++;
          if(ok1==1)
            {i1=i;
            j1=j;
            ok1=0;}
          i2=i;
          j2=j;}}
          if(c==(i2-i1+1)*(j2-j1+1))
          {for(i=i1;i<=i2;i++)
            for(j=j1;j<=j2;j++)
            if(a[i][j]!=0)
            {cout<<"NU";
            ok=0;
            break;}
          if(ok==1)
            cout<<"DA";}
            else
                cout<<"NU";
    return 0;
}

2.
#include <bits/stdc++.h>

using namespace std;
int echilibrat(int n)
{int i=1,si=0,sp=0;
while(n)
{if(i==1)
{si=si+n%10;
i=0;
n/=10;}
else
{sp=sp+n%10;
i=1;
n/=10;
}}
if(si==sp)
    return 1;
return 0;

}
int main()
{
   int a,b,i;
   cin>>a>>b;
   for(i=b-1;i>=a+1;i--)
    if(echilibrat(i)==1)
    cout<<i<<" ";
    return 0;
}

3.