Fix mistake in DP (#1326)

```cpp

int a[MAXN];

int dp() {

  int now = 0, ans = 1;

  int now = 1, ans = 1;

  for (int i = 2; i <= n; i++) {

    if (a[i] > a[i - 1]) ans++;

    now = max(now, ans);

    if (a[i] > a[i - 1])

      now++;

    else

      now = 1;

    ans = max(now, ans);

  }

  return ans;

}