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#include <iostream>
using namespace std;
 
int main() {
int i=0;
    int j=k-1;
    while(j<n){
        set <int> s;
        for(int m=i;m<=j;m++){
            s.insert(A[m]);
        }
        cout<<s.size()<<" ";
        i++;
        j++;
 
    }
    printf("\n");
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:11: error: ‘k’ was not declared in this scope
     int j=k-1;
           ^
prog.cpp:7:13: error: ‘n’ was not declared in this scope
     while(j<n){
             ^
prog.cpp:8:9: error: ‘set’ was not declared in this scope
         set <int> s;
         ^~~
prog.cpp:8:14: error: expected primary-expression before ‘int’
         set <int> s;
              ^~~
prog.cpp:10:13: error: ‘s’ was not declared in this scope
             s.insert(A[m]);
             ^
prog.cpp:10:22: error: ‘A’ was not declared in this scope
             s.insert(A[m]);
                      ^
prog.cpp:12:15: error: ‘s’ was not declared in this scope
         cout<<s.size()<<" ";
               ^

Standard output is empty