Be Unique (20)

比较简单。

#include "iostream"#include "string"#include "vector"#include "cstring"using namespace std;int Num[10001];int main(){int n;cin >> n;vector<int> data(n);memset(Num, 0, sizeof(Num));for (int i = 0; i < n; i++){cin >> data[i];Num[data[i]]++;}int winner = -1;for (int i = 0; i < n; i++){if (Num[data[i]] == 1){winner = data[i];break;}}if (winner == -1)cout << "None";elsecout << winner;}