PAT A1144

题目操蛋就操蛋在给出的int范围内的数可能会使得数组开不够，所以用map可能好一点#include <iostream>#include <map>using namespace std;int main() { int n, a, num = 0; cin >> n; map<int, int> m; for (int i = 0; i < n; i++) { cin >> a; m[a]++; } while(++num) if (m[num] == 0) break; cout << num; return 0;}