hdu 5349 MZL's simple problem（水）

题目链接：hdu 5349 MZL's simple problem

#include <cstdio>#include <cstring>#include <set>#include <algorithm>using namespace std;typedef set<int>::iterator iter;set<int> S;int main () {int n, k, x;while (scanf("%d", &n) == 1) {S.clear();while (n--) {scanf("%d", &k);if (k == 1) {scanf("%d", &x);S.insert(x);} else if (k == 2 && !S.empty())S.erase(S.begin());else if (k == 3) {if (S.empty())printf("0\n");else {iter it = S.end();it--;printf("%d\n", *it);}}}}return 0;}