题解 | #数组中出现次数超过一半的数字#
数组中出现次数超过一半的数字
https://www.nowcoder.com/practice/e8a1b01a2df14cb2b228b30ee6a92163
简单的hash表查找法
#include <unordered_map>
class Solution {
public:
int MoreThanHalfNum_Solution(vector<int>& numbers) {
unordered_map<int, int> hash;
int len = numbers.size();
for (int i = 0; i < len; i++) {
if (hash.find(numbers[i]) == hash.end()) {
hash[numbers[i]] = 1;
} else {
hash[numbers[i]]++;
}
if (hash[numbers[i]] > len / 2) {
return numbers[i];
}
}
return -1;
}
};
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