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添加0018.四数之和.md的Java版本的注释

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Lines changed: 3 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -253,7 +253,7 @@ public class Solution {`
`253`	`253`	`for (int k = 0; k < nums.length; k++) {`
`254`	`254`	`// 剪枝处理`
`255`	`255`	`if (nums[k] > target && nums[k] >= 0) {`
`256`		`- break;`
	`256`	`+ break; // 此处的break可以等价于return result;`
`257`	`257`	`}`
`258`	`258`	`// 对nums[k]去重`
`259`	`259`	`if (k > 0 && nums[k] == nums[k - 1]) {`
`@@ -262,7 +262,7 @@ public class Solution {`
`262`	`262`	`for (int i = k + 1; i < nums.length; i++) {`
`263`	`263`	`// 第二级剪枝`
`264`	`264`	`if (nums[k] + nums[i] > target && nums[k] + nums[i] >= 0) {`
`265`		`- break;`
	`265`	`+ break; // 注意是break到上一级for循环,如果直接return result;会有遗漏`
`266`	`266`	`}`
`267`	`267`	`// 对nums[i]去重`
`268`	`268`	`if (i > k + 1 && nums[i] == nums[i - 1]) {`
`@@ -802,3 +802,4 @@ end`
`802`	`802`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`
`803`	`803`	`<img src="../pics/网站星球宣传海报.jpg" width="1000"/>`
`804`	`804`	`</a>`
	`805`	`+`

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