varianta

I.
1.b
2.c
3.a
4.c
5.d

II.
1.a.110
  b.119,2 ; 3 118
  c.
#include <bits/stdc++.h>
using namespace std;

int main()
{
   int a,b,n,x;
   cin>>a>>b;
   x=0;
   do
   {x=x*10+a%10+b%10;
   a/=10;
   b/=10;}while(a!=0||b!=0);
   n=0;
   do
   {n=n*10+x/10%10;
    x/=100;}while(x!=0);
    cout<<n;
    return 0;
}
    d.

2.
int ok=0;
for(i=1;i<=30;i++)
cin>>x[i].nr_mat>>x[i].data.zi>>x[i].data.luna>>x[i].data.an;
for(i=30;i>=1;i--)
if(x[i].data.an%2==0)
{cout<<i;
ok=1;}
if(ok==0)
cout<<"nu exista";

3.
for(i=1;i<=7;i++)
for(j=1;j<=7;j++)
if(i==j || i+j==n+1)
a[i][j]="!";
else
if(i<j && i+j<n+1)||(j>i && i+j>n+1)
a[i][j]="#"
else
a[i][j]="?"

III.
1.
int v[1001];
void radical(int n,int k,int &a,int &b)
{int d=2,maxi=0,p,i;
a=1;
b=1;

while(n>1)
{p=0;
    while(n%d==0)
{n=n/d;
p++;}
maxi=max(d,maxi);
v[d]=p;
d++;
if(n>1 && d*d>n)
 d=n;
}

 for(i=1;i<=maxi;i++)
 {while(v[i]>=k)
 {a=a*i;
 v[i]=v[i]-k;}
 while(v[i])
    {b=b*i;
    v[i]--;}
 }

}

2.
#include <bits/stdc++.h>
using namespace std;
int main()
{char s[200];
int i,j,c1,c2,cc,cv,ok=0;
cin.getline(s,201);
for(i=0;i<=strlen(s);i++)
    {
        if(s[i]>='a' && s[i]<='z' && ok==0)
    {ok=1;
        c1=i;
    if(strchr("aeiou",s[i])!=0)
        cv++;
    else
        cc++;}
        else
            if(s[i]>='a' && s[i]<='z' && ok==1)
        {c2=i;
        if(ok==1)
        if(strchr("aeiou",s[i])!=0)
        cv++;
    else
        cc++;}
       else
        if(s[i]==' ')
            {ok=0;
            if(cc==cv)
                for(j=c1;j<=c2;j++)
                s[j]=(char)'z'-s[j]+'a';
                cv=0;
                cc=0;}

        }

    cout<<s;
    return 0;
}

3.
#include <bits/stdc++.h>
using namespace std;
ifstream fin("cifre.in");
int ap[11];
int main()
{int n,cn,r=0,cc,cv,i,c=0;
fin>>n;
cn=n;
while(cn)
{ap[cn%10]++;
cn/=10;}
for(i=0;i<=9;i++)
    if(ap[i]%2==1)
    {c++;
    cv=i;}

if(c>1)
    cout<<"IMPOSIBIL";
else
    {for(i=9;i>=0;i--)
    {cc=ap[i]/2;
    while(cc)
   {r=r*10+i;
    cc--;
    }}
    r=r*10+cv;
    for(i=9;i>=0;i--)
    {cc=ap[i]/2;
    while(cc)
   {r=r*10+i;
    cc--;
    }}
    cout<<r;}
    return 0;
}