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int n;
set<pair<int, int>> st;
void solve(int i, int x, int y, int turn){
    if(i == n)
    {
        st.insert({x, y});
        return;
    }
 
 
    if(turn == 1 || turn == 0)
    {
        solve(i + 1, x, y + 1, 2);
        solve(i + 1, x, y - 1, 2);
    }
    if(turn == 2 || turn == 0)
    {
        solve(i + 1, x + 1, y, 1);
        solve(i + 1, x - 1, y, 1);
    }
}
 
//let n be the number of moves
//call solve(0, 0, 0, 0);
//Answer is st.size();

prog.cpp:2:1: error: ‘set’ does not name a type
 set<pair<int, int>> st;
 ^~~
prog.cpp: In function ‘void solve(int, int, int, int)’:
prog.cpp:6:9: error: ‘st’ was not declared in this scope
         st.insert({x, y});
         ^~
prog.cpp:6:9: note: suggested alternative: ‘std’
         st.insert({x, y});
         ^~
         std

Standard output is empty