4639 : Tutorial: STL Set 3
https://jungol.co.kr/bbs/board.php?bo_table=pbank&code=4639&sca=5010 JUNGOL www.jungol.co.kr #include using namespace std; int main() { set s; int n; cin >> n; set::iterator it,p,b; while(n--){ char cmd; int a; cin >> cmd >> a; if(cmd == 'i') s.insert(a); else if(cmd == 'r') s.erase(a); else if(cmd == 'f'){ it = s.find(a); if(it != s.end()){ if(it!=s.begin()){ p = prev(it); b = next(it); if(b !=..