func_code_string: #include <bits/stdc++.h>   const int LG = 21;   const int N = 500005;   const long long MOD = 1e9 + 7;   const long long INF = 1e9;   const long long INFLL = 1e18;   using namespace std;   void dfs(int v, int paint, vector<int> &col,            vector<vector<pair<int, int> > > &graph, vector<int> &need, int &cnt0,            int &cnt1, int &fl) {     col[v] = paint;     if (paint == -1)       cnt0++;     else       cnt1++;     if (need[v] != 0) {       if (paint == need[v])         fl = 1;       else         fl = -1;     }     for (auto p : graph[v]) {       if (col[p.first] == 0) {         dfs(p.first, p.second * paint, col, graph, need, cnt0, cnt1, fl);       }     }   }   int root[N];   vector<int> suns[N];   int cntsame[N];   int sametoroot[N];   int fl[N];   int ans;   int Root(int x) { return root[x] == x ? x : Root(root[x]); }   void complete_data(int v, int FL) {     int x = Root(v);     if (fl[x] != 0) return;     FL *= sametoroot[v];     int took_before = min(cntsame[x], (int)suns[x].size() - cntsame[x]);     ans -= took_before;     fl[x] = FL;     if (FL == 1)       ans += cntsame[x];     else       ans += suns[x].size() - cntsame[x];   }   void Merge(int v, int u, int w) {     int x = Root(v), y = Root(u);     if (x == y) return;     if (suns[x].size() > suns[y].size()) {       swap(v, u);       swap(x, y);     }     w *= sametoroot[v];     w *= sametoroot[u];     if (fl[x] == 0 && fl[y] == 0) {       ans -= min(cntsame[x], (int)suns[x].size() - cntsame[x]);       ans -= min(cntsame[y], (int)suns[y].size() - cntsame[y]);     }     if (fl[x] == 0 && fl[y] != 0) {       complete_data(x, fl[y] * w);     }     if (fl[x] != 0 && fl[y] == 0) {       complete_data(y, fl[x] * w);     }     for (auto u : suns[x]) {       suns[y].push_back(u);       sametoroot[u] *= w;       if (sametoroot[u] == 1) cntsame[y]++;     }     if (fl[x] == 0 && fl[y] == 0) {       ans += min(cntsame[y], (int)suns[y].size() - cntsame[y]);     }     root[x] = y;   }   signed main() {     srand(time(NULL));     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int n, k;     cin >> n >> k;     string s;     cin >> s;     vector<vector<int> > contains(n);     for (int i = 0; i < k; i++) {       int c;       cin >> c;       for (int j = 0; j < c; j++) {         int x = 0;         cin >> x;         x--;         contains[x].push_back(i);       }     }     vector<vector<pair<int, int> > > graph(k);     vector<int> need(k, 0);     for (int i = 0; i < k; i++) root[i] = i;     for (int i = 0; i < k; i++) suns[i].push_back(i);     for (int i = 0; i < k; i++) cntsame[i] = 1;     for (int i = 0; i < k; i++) sametoroot[i] = 1;     for (int i = 0; i < n; i++) {       if (contains[i].size() == 1) {         if (s[i] ==  1 ) {           need[contains[i][0]] = -1;           complete_data(contains[i][0], -1);         } else {           need[contains[i][0]] = 1;           complete_data(contains[i][0], 1);         }       }       if (contains[i].size() == 2) {         if (s[i] ==  0 ) {           graph[contains[i][0]].push_back({contains[i][1], -1});           graph[contains[i][1]].push_back({contains[i][0], -1});           Merge(contains[i][0], contains[i][1], -1);         } else {           graph[contains[i][0]].push_back({contains[i][1], 1});           graph[contains[i][1]].push_back({contains[i][0], 1});           Merge(contains[i][0], contains[i][1], 1);         }       }       cout << ans << endl;     }   }   