Language: C++

‪#include <bits/stdc++.h>‬
#define FOR(i, begin, end) for(int i=(begin);i<(end);i++)‬
#define REP(i, n) FOR(i,0,n)‬
#define IFOR(i, begin, end) for(int i=(end)-1;i>=(begin);i--)‬
#define IREP(i, n) IFOR(i,0,n)
#define SORT(a) sort(a.begin(), a.end())‬
#define REVERSE(a) reverse(a.begin(), a.end())‬
#define Lower_bound(v, x) distance(v.begin(), lower_bound(v.begin(), v.end(), x))‬
#define Upper_bound(v, x) distance(v.begin(), upper_bound(v.begin(), v.end(), x))‬
#define int long long‬
#define INF 1000000000000000000‬
‪using namespace std;‬

‪typedef vector<int> vec;‬
‪typedef vector<vec> mat;‬
‪typedef pair<int, int> Pii;‬

‪template<typename T>‬
‪void readvec(vector<T> &a);‬
‪void readindex(vector<int> &a);‬



‪signed main(){‬

‪    ‬int n;
    cin >> n
    vec L(n);
    readvec(L);
    SORT(L);
    int ans = 0:
    REP(i, n)a{
      ans += L[2 * i];
    }
    cout << ans;
    
‪    return 0;‬
‪}‬


‪template<typename T>‬
‪void readvec(vector<T> &a){‬
‪    REP(i, a.size()){‬
‪        cin >> a[i];‬
‪    }‬
‪}‬
‪void readindex(vector<int> &a){‬
‪    REP(i, a.size()){‬
‪        cin >> a[i];‬
‪        a[i]--;‬
‪    }‬
‪}‬


Compiler output:
a.cc:1: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
    1 | <U+202A>#include <bits/stdc++.h><U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:1:1: error: stray '#' in program
    1 | ‪#include <bits/stdc++.h>‬
      | ^
a.cc:12:5: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   12 | <U+202A>using namespace std;<U+202C>
      | ~~~~~~~~    ^
      | |           |
      | |           end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:14:7: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   14 | <U+202A>typedef vector<int> vec;<U+202C>
      | ~~~~~~~~      ^
      | |             |
      | |             end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:15:7: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   15 | <U+202A>typedef vector<vec> mat;<U+202C>
      | ~~~~~~~~      ^
      | |             |
      | |             end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:16:7: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   16 | <U+202A>typedef pair<int, int> Pii;<U+202C>
      | ~~~~~~~~      ^
      | |             |
      | |             end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:18:8: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   18 | <U+202A>template<typename T><U+202C>
      | ~~~~~~~~       ^
      | |              |
      | |              end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:19:4: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   19 | <U+202A>void readvec(vector<T> &a);<U+202C>
      | ~~~~~~~~   ^
      | |          |
      | |          end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:20:4: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   20 | <U+202A>void readindex(vector<int> &a);<U+202C>
      | ~~~~~~~~   ^
      | |          |
      | |          end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:24:6: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   24 | <U+202A>signed main(){<U+202C>
      | ~~~~~~~~     ^
      | |            |
      | |            end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:26: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   26 | <U+202A>    <U+202C>int n;
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:37: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   37 | <U+202A>    return 0;<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:38: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   38 | <U+202A>}<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:41:8: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   41 | <U+202A>template<typename T><U+202C>
      | ~~~~~~~~       ^
      | |              |
      | |              end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:42:4: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   42 | <U+202A>void readvec(vector<T> &a){<U+202C>
      | ~~~~~~~~   ^
      | |          |
      | |          end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:43: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   43 | <U+202A>    REP(i, a.size()){<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:44: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   44 | <U+202A>        cin >> a[i];<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:45: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   45 | <U+202A>    }<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:46: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   46 | <U+202A>}<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:47:4: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   47 | <U+202A>void readindex(vector<int> &a){<U+202C>
      | ~~~~~~~~   ^
      | |          |
      | |          end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:48: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   48 | <U+202A>    REP(i, a.size()){<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:49: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   49 | <U+202A>        cin >> a[i];<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:50: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   50 | <U+202A>        a[i]--;<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:51: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   51 | <U+202A>    }<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:52: warning: unpaired UTF-8 bidirectional control character detected [-Wbidi-chars=]
   52 | <U+202A>}<U+202C>
      | ~~~~~~~~ 
      | |       |
      | |       end of bidirectional context
      | U+202A (LEFT-TO-RIGHT EMBEDDING)
a.cc:1:1: error: '\U0000202a' does not name a type
    1 | ‪#include <bits/stdc++.h>‬
      |  
a.cc:12:21: error: '\U0000202c' does not name a type
   12 | ‪using namespace std;‬
      |                      
a.cc:14:25: error: '\U0000202c' does not name a type
   14 | ‪typedef vector<int> vec;‬
      |                          
a.cc:15:25: error: '\U0000202c' does not name a type
   15 | ‪typedef vector<vec> mat;‬
      |                          
a.cc:16:28: error: '\U0000202c' does not name a type
   16 | ‪typedef pair<int, int> Pii;‬
      |                             
a.cc:19:28: error: '\U0000202c' does not name a type
   19 | ‪void readvec(vector<T> &a);‬
      |                             
a.cc:20:32: error: '\U0000202c' does not name a type
   20 | ‪void readindex(vector<int> &a);‬
      |                                 
a.cc:38:2: error: '\U0000202c' does not name a type
   38 | ‪}‬
      |   
a.cc:46:2: error: '\U0000202c' does not name a type
   46 | ‪}‬
      |   
a.cc:52:2: error: '\U0000202c' does not name a type
   52 | ‪}‬
      |