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#include<unordered_map>
void pairSum(int input[], int size, int x) {
    /* Don't write main().
     * Don't read input, it is passed as function argument.
     * Print the output and don't return it.
     * Taking input is handled automatically.
     */
	unordered_map<int,int>m;
    for(int i=0;i<size;i++){
 
        int rem = x-input[i];
        if(m.find(rem)!=m.end()){
            int count = m[rem];
            for(int j = 0; j<count; j++){
                if(rem<input[i]){
                    cout<<rem<<" "<<input[i]<<endl;
                }
                else{
                    cout<<input[i]<<" "<<rem<<endl;
                }
            }
        }
        m[input[i]]++;
    }
    cout<<endl;
}

prog.cpp: In function ‘void pairSum(int*, int, int)’:
prog.cpp:8:2: error: ‘unordered_map’ was not declared in this scope
  unordered_map<int,int>m;
  ^~~~~~~~~~~~~
prog.cpp:8:2: note: suggested alternative:
In file included from /usr/include/c++/8/unordered_map:47,
                 from prog.cpp:1:
/usr/include/c++/8/bits/unordered_map.h:102:11: note:   ‘std::unordered_map’
     class unordered_map
           ^~~~~~~~~~~~~
prog.cpp:8:16: error: expected primary-expression before ‘int’
  unordered_map<int,int>m;
                ^~~
prog.cpp:12:12: error: ‘m’ was not declared in this scope
         if(m.find(rem)!=m.end()){
            ^
prog.cpp:16:21: error: ‘cout’ was not declared in this scope
                     cout<<rem<<" "<<input[i]<<endl;
                     ^~~~
prog.cpp:16:21: note: suggested alternative: ‘count’
                     cout<<rem<<" "<<input[i]<<endl;
                     ^~~~
                     count
prog.cpp:16:47: error: ‘endl’ was not declared in this scope
                     cout<<rem<<" "<<input[i]<<endl;
                                               ^~~~
prog.cpp:16:47: note: suggested alternative: ‘enum’
                     cout<<rem<<" "<<input[i]<<endl;
                                               ^~~~
                                               enum
prog.cpp:19:21: error: ‘cout’ was not declared in this scope
                     cout<<input[i]<<" "<<rem<<endl;
                     ^~~~
prog.cpp:19:21: note: suggested alternative: ‘count’
                     cout<<input[i]<<" "<<rem<<endl;
                     ^~~~
                     count
prog.cpp:19:47: error: ‘endl’ was not declared in this scope
                     cout<<input[i]<<" "<<rem<<endl;
                                               ^~~~
prog.cpp:19:47: note: suggested alternative: ‘enum’
                     cout<<input[i]<<" "<<rem<<endl;
                                               ^~~~
                                               enum
prog.cpp:23:9: error: ‘m’ was not declared in this scope
         m[input[i]]++;
         ^
prog.cpp:25:5: error: ‘cout’ was not declared in this scope
     cout<<endl;
     ^~~~
prog.cpp:25:11: error: ‘endl’ was not declared in this scope
     cout<<endl;
           ^~~~
prog.cpp:25:11: note: suggested alternative: ‘enum’
     cout<<endl;
           ^~~~
           enum

Standard output is empty