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Merge pull request youngyangyang04#2597 from stevenleon99/patch-1

Update 0018.四数之和.md

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Original file line number	Diff line number	Diff line change
`@@ -262,6 +262,11 @@ class Solution {`
`262`	`262`
`263`	`263`	`for (int j = i + 1; j < nums.length; j++) {`
`264`	`264`
	`265`	`+ // nums[i]+nums[j] > target 直接返回, 剪枝操作`
	`266`	`+ if (nums[i]+nums[j] > 0 && nums[i]+nums[j] > target) {`
	`267`	`+ return result;`
	`268`	`+ }`
	`269`	`+`
`265`	`270`	`if (j > i + 1 && nums[j - 1] == nums[j]) { // 对nums[j]去重`
`266`	`271`	`continue;`
`267`	`272`	`}`

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