Java Algorithm Blue Bridge Cup (question + answer) number of briquettes

1. Number of briquettes (results fill in the blanks)

There was a heap of briquettes, piled into triangular pyramid. Specific:
1 on the first floor,
The second Layer 3 (arranged into triangles),
The third layer of 6 (arranged into triangles),
Fourth layer 10 (arranged into triangles),
....
If there are 100 floors, how many briquettes are there?

Please fill in the total number of briquettes.
Note: You should submit an integer, do not fill in any superfluous content or descriptive text.

1  Public class_1 briquettes Number {2     Public Static voidMain (string[] args) {3       intSum=0;4       intDangqian = 0;5        for(inti = 1; I <= 100; i++) {6Dangqian + =i;7Sum + =Dangqian;8       }9 System.out.println (sum);Ten    } One}

Run Result: 171700

Java Algorithm Blue Bridge Cup (question + answer) number of briquettes