169. Majority Element

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Given an array of size n, find the majority element. The majority element is the element that appears more than n/2 times.
You may assume that the array is non-empty and the majority element always exist in the array.
思路1:
使用map来处理。
class Solution {
public:
int majorityElement(vector& nums) {
map record;
for (int i = 0; i < nums.size(); i++)
{
if (record.find(nums[i]) == record.end())
{
record.insert(pair(nums[i], 1));
if (record[nums[i]] > nums.size() / 2)
{
return nums[i];
}
}
else
{
record[nums[i]] += 1;
if (record[nums[i]] > nums.size() / 2)
{
return nums[i];
}
}
}
return 0;
}
}; 思路2:
采用双循环
int majorityElement(vector& nums) { int hit = 0; int currentElem; for (int i = 0; i < nums.size(); i++) { currentElem = nums[i]; hit = 0; for (int j = 0; j < nums.size(); j++) { if (nums[j] == currentElem) { hit++; if (hit > nums.size() / 2) { return currentElem; } } } } return 0; }
2016-08-10 12:19:37