题解 | #数组中重复的数字#
数组中重复的数字
https://www.nowcoder.com/practice/6fe361ede7e54db1b84adc81d09d8524
#include <fstream>
class Solution {
public:
int duplicate(vector<int>& numbers) {
int n = numbers.size();
if(n<1) return -1;
for(int i = 0;i<n;i++){
while (numbers[i]!=i) {
if(numbers[i]==numbers[numbers[i]]){
return numbers[i];
}
swap(numbers[i], numbers[numbers[i]]);
}
}
return -1;
}
};
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