vector<pair<int, int>> path;

pair<int, int> cur = {x2, y2};
path.push_back(cur);

while (pr[cur.first][cur.second] != {-1, -1}) {
    cur = pr[cur.first][cur.second];
    path.push_back(cur);
}

reverse(path.begin(), path.end());

for (pair<int, int> v : path) {
    cout << v.first << ' ' << v.second << '\n';
}
error: expected primary-expression before '{' token|
error: expected ')' before '{' token|
error: expected ';' before '}' token|
error: expected primary-expression before ')' token|

pair<int, int> pr[n][n];

pr[cur.first][cur.second]

pair<int, int>