T
   TE
  TES
 TEST
 EST
 ST
 T

#include<iostream>
int main() {
char* a[] = {"t","e","s","t",""};
int k=0, i,j;
for(i=0; i<4; i++) {
    while(k<3) {
        cout<<" ";
        k++;
    }
    k=i+1;
    for(j=0; j<=i; j++) {
        cout<<a[j];
    }
    cout<<"n";
}
for(i=1; i<4; i++) {
    for(j=i; j<4; j++) {
        cout<<a[j];
    }
    cout<<"n";
}
return 0;
}

#include <stdio.h>

int main() {
    puts("   T");
    puts("  TE");
    puts(" TES");
    puts("TEST");
    puts("EST ");
    puts("ST  ");
    puts("T   ");
}