triangle challenge

i understood now with above image.

public int triangle(int rows) {
  if(rows==1){
    return 1;
  }
  return rows+triangle(rows-1);
}

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above fails one test case

xpected      Run            
triangle(0) → 0      Exception:java.lang.StackOverflowError (line number:2)      X      
triangle(1) → 1      1      OK      
triangle(2) → 3      3      OK      
triangle(3) → 6      6      OK      
triangle(4) → 10      10      OK      
triangle(5) → 15      15      OK      
triangle(6) → 21      21      OK      
triangle(7) → 28      28      OK      
other tests

how to decide base case begin with 0 or with 1. it is failing 0 case now

how to decide base case begin with 0

Just do the same with base case with 0 instead of 1.

with one failing one.

with 0 base case all passing

public int triangle(int rows) {
  if(rows==0){
    return 0;
  }
  return rows+triangle(rows-1);
}

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