Pattern

1.
  *
 ***
*****

for (int i = 0; i < n; i++) {
     for (int j = 0; j < n-1-i; j++) {
          cout<<" ";
      }
      for (int j = n-i-1; j < n; j++) {
          cout<<"*";
      }
      for (int j = n-i; j < n; j++) {
          cout<<"*";
      }
      cout<<endl;
    }

2.
*****
 ***
  *
    for (int i = 0; i < n; i++) {
      for (int j = 0; j < n; j++) {
          if(i>0&&j<=1&& i!=j) cout<<" ";
          else cout<<"*";
      }
      for (int j = n; j <= n+1-i; j++) {
          cout<<"*";
      }
      cout<<endl;
    }

3.
    *
  * * *
 * * * * 
 * * * *
  * * *
    *
//upper half
 for(int i=0;i<n;i++){
       for(int j=0;j<n-i-1;j++){
           cout<<" ";
       }
       for(int j=0;j<2*i+1;j++) cout<<"*";
       for(int j=0;j<n-i-1;j++) cout<<" ";
       cout<<endl;
   }
//lower half
   for(int i=0;i<n;i++){
       for(int j=0;j<i;j++){
           cout<<" ";
       }
       for(int j=0;j<(2*n)-(2*i+1);j++) cout<<"*";
       for(int j=0;j<i;j++) cout<<" ";
       cout<<endl;
   }

4.
*
**
***
**
*
//upper half
 for(int i=0;i<n;i++){
        for(int j=0;j<=i;j++) cout<<"*";
        cout<<endl;
    }
//lower half
      for(int i=1;i<n;i++){
        for(int j=0;j<n-i;j++) {
            cout<<"*";
        }
        cout<<endl;
    }

5.
1
0 1
1 0 1
0 1
1
int flag=false;
    for(int i=0;i<n;i++){
        for(int j=0;j<=i;j++) {
            flag=!flag;
            if(flag) cout<<"1 ";
            else cout<<"0 ";
        }
        if(i%2!=0) flag=!flag;
        cout<<endl;
    }
   for(int i=0;i<n;i++){
        for(int j=0;j<n-i;j++) {
          flag=!flag;
            if(flag) cout<<"1 ";
            else cout<<"0 ";
        }
        if(i%2!=0) flag=!flag;
        cout<<endl;
     }

6.
1         1
1 2     2 1
1 2 3 3 2 1

 for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(j<=i)cout<<j+1<<" ";
            else cout<<"  ";
            
        }
        for(int j=n;j<2*n;j++){
            if(j<=2*n-(i+2)) cout<<"  ";
            else cout<<2*n-j<<" ";
            
        }
        cout<<endl;
    }

7.
1 
2 3
4 5 6
//with n=3
int c=0;
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<=i;j++){
            cout<<++c<<" ";
        }
        cout<<endl;
    }

8.
A
A B 
A B C
 for(int i=0;i<n;i++){
         int alphaNum=65;
        for(int j=0;j<=i;j++){
            cout<<char(alphaNum)<<" ";
            alphaNum++;
        } 
        cout<<endl;
    }

9.
A B C
A B
A
for(int i=0;i<n;i++){
        int alphaNumber=65;
        for(int j=0;j<n-i;j++){
            cout<<char(alphaNumber)<<" ";
            alphaNumber++;
        }
        cout<<endl;
    }
10.
A 
B B
C C C
int alphaNum=65;
    for(int i=0;i<n;i++){
        for(int j=0;j<=i;j++){
            cout<<char(alphaNum)<<" ";
        }
        alphaNum++;
        cout<<endl;
    }
11.
   A
 A B A
A B C B A
 for(int i=0;i<n;i++){
     for(int j=0;j<n-(i+1);j++){
            cout<<"  ";
        }
         char ch ='A';
        for(int j=1;j<=2*i+1;j++){
             cout<<ch<<" ";
            if(j<= (2*i+1)/2) ch++;
            else  ch--;
        }
         for(int j=0;j<n-(i+1);j++){
            cout<<"  ";
        }
        cout<<endl;
    }
12.
***
* *
***
for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(i==0||j==0||j==n-1||i==n-1) cout<<"*";
            else cout<<" ";
        }
        cout<<endl;
    }
13.
33333
32223
32123
32223
33333
 for(int i=0;i<2*n-1;i++){
        for(int j=0;j<2*n-1;j++){
           int top=i, bottom=j, right= (2*n-2)-j,left = (2*n-2)-i;
           cout<<n- min(min(top, bottom), min(right,left))<<" ";
        }
        cout<<endl;
    }
14.
* * * * * * 
* *     * * 
*         *
*         *
* *     * * 
* * * * * * 

    int x=0;
    for(int i=0;i<n;i++){
        for(int j=1;j<=n-i;j++) cout<<"* ";
        for(int j=0;j<x;j++) cout<<"  ";
        for(int j=1;j<=n-i;j++) cout<<"* ";
        x=x+2;
        cout<<endl;
    }
    x= 2*n-2;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=i;j++) cout<<"* ";
        for(int j=0;j<x;j++) cout<<"  ";
        for(int j=1;j<=i;j++) cout<<"* ";
        x=x-2;
        cout<<endl;
    }
15.
*    *
**  **
******
**  **
*    *
 int x= 2*n-2;
 for(int i=1;i<=2*n-1;i++){
 int s=i;
 if(i>n) s= 2*n-i;
  for(int j=1;j<=s;j++) cout<<"* ";
  for(int j=1;j<=x;j++) cout<<"  ";
  for(int j=1;j<=s;j++) cout<<"* ";
  cout<<endl;
  if(i<n) x=x-2;
  else x=x+2;
 }