// https://leetcode-cn.com/problems/arithmetic-slices/

var Test = require('./Common/Test');

var numberOfArithmeticSlices = function (A) {

const length = A.length;

let result = 0;

for (let i = 3, isOdd = true; i <= length; i++, isOdd = !isOdd) {

if (i == 3) {

result = 1;

}

else {

let plus = 0;

const start = isOdd ? (i - 1) / 2 : i / 2;

for (let j = start; j >= 2; j--) {

plus += Math.trunc((i - 1) / j) - 1;

}

result += (i - 2) + plus;

}

}

return result;

}

function test(nums) {

Test.test(numberOfArithmeticSlices, nums);

}

test([1, 2, 3, 4, 5, 6]);

test([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);

test([2, 2, 3, 4]);

test([2, 4, 6, 8, 10]);

// [1, 2, 3, 4, 5, 6]

// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

// [2, 2, 3, 4]

// [2, 4, 6, 8, 10]