题解的Code：

int c = 1, cnt = 0;
for (int i = 1; i <+ n; ++i) {
    cin >> x;
    if (c == i) {
        c = c + x;
        ++cnt;
    }
}
if (c == n) {
    cout << "Yes" << endl;
} else {
    cout << "No" << endl;
}
cout << cnt << endl;

第二行： for (int i = 1; i <+ n; ++i) {

是不是要改成： for (int i = 1; i <= n; ++i) {?

应该@谁？