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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5.     set<int> s;
  6.     int q;
  7.     while(cin >> q){
  8.         if(q == 1){
  9.             int x;
  10.             cin >> x;
  11.             s.insert(x);
  12.         }
  13.         else if(q == 2){
  14.             int x;
  15.             cin >> x;
  16.             if(s.find(x) != s.end()){
  17.                 s.erase(x);
  18.             }
  19.         }
  20.         else if(q == 3){
  21.             if(s.empty() == 1){
  22.                 cout << "empty\n";
  23.  
  24.             }
  25.             else cout << *s.begin() << "\n";
  26.         }
  27.         else if(q == 4){
  28.             if(s.empty() == 1){
  29.                 cout << "empty\n";
  30.  
  31.             }
  32.             else cout << *s.rbegin() <<  "\n";
  33.         }
  34.         else if(q == 5){
  35.             int x;
  36.             cin >> x;
  37.             if(s.empty() == 1){
  38.                 cout << "empty\n";
  39.  
  40.             }
  41.             else{
  42.                 auto it = s.upper_bound(x);
  43.                 if(it == s.end()){
  44.                     cout << "no\n";
  45.                 }
  46.                 else{
  47.                     cout << *it << "\n";
  48.                 }
  49.             }
  50.         }
  51.         else if(q == 6){
  52.             int x;
  53.             cin >> x;
  54.             if(s.empty() == 1){
  55.                 cout << "empty\n";
  56.  
  57.             }
  58.             else {
  59.                 auto it = s.lower_bound(x);
  60.                 if(it == s.end()){
  61.                         cout << "no\n";
  62.                     }
  63.                 else{
  64.                     cout << *it << "\n";
  65.                 }
  66.             }
  67.  
  68.         }
  69.         else if(q == 7){
  70.             int x;
  71.             cin >> x;
  72.             if(s.empty() == 1){
  73.                 cout << "empty\n";
  74.  
  75.             }
  76.             else {
  77.                 auto it = s.lower_bound(x);
  78.                 it--;
  79.                 int y = *it;
  80.                 if(s.count(y) && y < x){
  81.                     cout << y << "\n";
  82.                 }
  83.                 else{
  84.                     cout << "no\n";
  85.                 }
  86.  
  87.             }
  88.  
  89.         }
  90.         else if(q == 8){
  91.             int x;
  92.             cin >> x;
  93.             if(s.empty() == 1){
  94.                 cout << "empty\n";
  95.  
  96.             }
  97.             else {
  98.                 auto it = s.upper_bound(x);
  99.                 it--;
  100.                 int y = *it;
  101.                 if(s.count(y) && y <= x){
  102.                     cout << y << "\n";
  103.                 }
  104.                 else{
  105.                     cout << "no\n";
  106.                 }
  107.             }
  108.  
  109.         }
  110.         else{
  111.             break;
  112.         }
  113.  
  114.     }
  115.  
  116.  
  117.     return 0;
  118. }
  119.  
Success #stdin #stdout 0.01s 5296KB
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stdout
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https://ideone.com/iEfJL4
language:
C++14 (gcc 8.3)
created:
4 hours ago
visibility:
public

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