CppBuzz

# C++ Programs on various Tree Problems

## Printing Reverse Rectangle using numbers

```
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1

Solution:-

#include <iostream>
using namespace std;

int main(int argc, char *argv[]) {
int count = 5;
int i,j,k;

for(i = 0 ; i<5; i++)
{
for(j=0; j<i; j++)
cout<<" ";
for(k=count; k>0; k-- )
cout<<k;
count--;
cout<<"\n";
}
return 0;
}
```

## Printing Triangle Pattern using numbers

```
1
1 2
1 2 3
1 2
1

Solution:-

#include<iostream>
using namespace std;

int main(int argc, char *argv[]) {
int count = 0;
int i,j;
int rows = 5;

for(i = 0 ; i<rows; i++)
{
if(i<=(rows/2))
count++;
else
count--;

for(j=1; j<=count; j++ )
cout<<j;
cout<<"\n";
}

return 0;
}
```

## Printing Rectangle one on Another Pattern using numbers

```
1 2 3
1 2
1
1 2
1 2 3

Solution:-

#include<iostream>
using namespace std;

int main(int argc, char *argv[]) {
int count = 0;
int i,j;
int rows = 5;
count = rows/2 +1;

for(i = 0 ; i<rows; i++)
{
for(j=1; j<=count; j++ )
cout<<j;
cout<<"\n";

if(i+1 <= count)
count --;
else
count++;
}
return 0;
}
```

## Printing two Rectangle Pattern using numbers

```
1 2 3 4 5 4 3 2 1
1 2 3 4   4 3 2 1
1 2 3       3 2 1
1 2           2 1
1               1

Solution:-

#include<iostream>
using namespace std;

int main(int argc, char *argv[]) {
int count = 0;
int i,j;
int rows = 5;
int temp = rows;
count = rows/2 +1;

for(i = 0 ; i<rows; i++)
{
for(j=1; j<=temp; j++)
cout<<j;
for(j=0; j<i; j++)
cout<<"  ";
for(j=temp;j>=1;j--)
cout<<j;
cout<<"\n";
temp--;
}
return 0;

}
```