用并查集来合并成功合成的一组药材,并且维护该组中药材一共有多少种药材,在之后遍历过程中我们统计每一组要求的每种药材在哪里出现过,并且将他们所出现的组的药材数量累加,如果累加数和当前要求数相同,说明每一种药材在之前都出现过,只需将这些组全部合并即可。
应为多个药材可能有相同父节点,所以用vector进行去重。
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #include
- #define int long long
- #define endl '\n'
- #define lowbit(x) x &(-x)
- #define mh(x) memset(x, -1, sizeof h)
- #define debug(x) cerr << #x << "=" << x << endl;
- #define brk exit(0);
- using namespace std;
- void TLE() { ios::sync_with_stdio(false), cin.tie(0), cout.tie(0); }
- const int N = 5e5 + 10;
- const int M = 2 * N;
- const int mod = 80112002;
- const double esp = 1e-6;
- const double pi = acos(-1);
- typedef pair<int, int> PII;
- typedef long long ll;
- int e[N], ne[N], h[N], cnt;
- int din[N], dout[N];
- int n, m;
- inline int read()
- {
- register int x = 0, f = 1;
- register char c = getchar();
- while (c < '0' || c > '9')
- {
- if (c == '-')
- f = -1;
- c = getchar();
- }
- while (c >= '0' && c <= '9')
- x = (x << 3) + (x << 1) + (c ^ 48), c = getchar();
- return x * f;
- }
- inline void write(register int x)
- {
- if (x > 9)
- write(x / 10);
- putchar(x % 10 + '0');
- }
- int p[N], Size[N];
- int find(int x)
- {
- if (x != p[x])
- p[x] = find(p[x]);
- return p[x];
- }
- void init()
- {
- for (int i = 0; i <= N; i++)
- {
- p[i] = i;
- Size[i] = 1;
- }
- }
- void merge(int a, int b)
- {
- a = find(a), b = find(b);
- if (a != b)
- {
- p[a] = p[b];
- Size[b] += Size[a];
- }
- }
- signed main()
- {
- int T, ans = 0;
- cin >> T;
- init();
- while (T--)
- {
- vector<int> cnt;
- int n;
- cin >> n;
- for (int i = 1; i <= n; i++)
- {
- int x;
- cin >> x;
- cnt.push_back(find(x));
- }
- sort(cnt.begin(), cnt.end());
- cnt.erase(unique(cnt.begin(), cnt.end()), cnt.end());
- int res = 0;
- for (auto t : cnt)
- {
- res += Size[t];
- }
- if (res == n)
- {
- ans++;
- for(auto t:cnt)
- {
- merge(cnt[0], t);
- }
- }
- }
- cout << ans << endl;
- return 0;
- }