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747. Largest Number At Least Twice of Others

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	`1`	`+/**`
	`2`	`+ * 747. Largest Number At Least Twice of Others`
	`3`	`+ * https://leetcode-cn.com/problems/largest-number-at-least-twice-of-others/`
	`4`	`+ * @param {number[]} nums`
	`5`	`+ * @return {number}`
	`6`	`+ */`
	`7`	`+var dominantIndex = function (nums) {`
	`8`	`+ let max1 = 0;`
	`9`	`+ let max2 = 0;`
	`10`	`+ let maxIndex = 0;`
	`11`	`+ for (let i = 0; i < nums.length; i++) {`
	`12`	`+ if (nums[i] > max1) {`
	`13`	`+ max2 = max1;`
	`14`	`+ max1 = nums[i];`
	`15`	`+ maxIndex = i;`
	`16`	`+ } else if (nums[i] > max2) {`
	`17`	`+ max2 = nums[i];`
	`18`	`+ }`
	`19`	`+ }`
	`20`	`+ return max1 >= max2 * 2 ? maxIndex : -1;`
	`21`	`+};`

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