219. Contains Duplicate II
Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j]and the difference between i and j is at most k.
题目大意:
找到数组中两个相同元素,如果这两个元素的距离小于等于k,则返回true。如果任意两个相同元素的距离都大于k,或者没有两个元素是相同的,那么返回false。
代码如下:
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class
Solution {
public
:
bool
containsNearbyDuplicate(vector<
int
>& nums,
int
k) {
unordered_map<
int
,
int
> myMap;
for
(
int
i = 0;i < nums.size();i++)
{
if
(myMap.find(nums[i]) == myMap.end())
{
myMap.insert(pair<
int
,
int
>(nums[i],i));
}
else
{
if
(i - myMap[nums[i]] <= k)
{
return
true
;
}
else
myMap[nums[i]] = i;
}
}
return
false
;
}
};
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本文转自313119992 51CTO博客,原文链接:http://blog.51cto.com/qiaopeng688/1837133