func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   const int maxn = 1e6 + 5;   class Tree {    public:     int son1, son2;     int val;     int op;     bool rev;     vector<int> v;   } tree[maxn];   int degree[maxn];   queue<int> q;   void dfs(int id) {     tree[id].rev = 1;     if (tree[id].op == 5) return;     if (tree[id].op == 1) {       if (tree[tree[id].son1].val) dfs(tree[id].son2);       if (tree[tree[id].son2].val) dfs(tree[id].son1);     }     if (tree[id].op == 2) {       if (!tree[tree[id].son1].val) dfs(tree[id].son2);       if (!tree[tree[id].son2].val) dfs(tree[id].son1);     }     if (tree[id].op == 3) {       dfs(tree[id].son1);       dfs(tree[id].son2);     }     if (tree[id].op == 4) {       dfs(tree[id].son1);     }   }   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     int n;     cin >> n;     for (int i = 1; i <= n; i++) {       tree[i].rev = 0;       string s;       cin >> s;       if (s ==  AND ) {         tree[i].op = 1;         cin >> tree[i].son1 >> tree[i].son2;         tree[tree[i].son1].v.push_back(i);         tree[tree[i].son2].v.push_back(i);         degree[i] = 2;       } else if (s ==  OR ) {         tree[i].op = 2;         cin >> tree[i].son1 >> tree[i].son2;         tree[tree[i].son1].v.push_back(i);         tree[tree[i].son2].v.push_back(i);         degree[i] = 2;       } else if (s ==  XOR ) {         tree[i].op = 3;         cin >> tree[i].son1 >> tree[i].son2;         tree[tree[i].son1].v.push_back(i);         tree[tree[i].son2].v.push_back(i);         degree[i] = 2;       } else if (s ==  NOT ) {         tree[i].op = 4;         cin >> tree[i].son1;         tree[tree[i].son1].v.push_back(i);         degree[i] = 1;       } else if (s ==  IN ) {         tree[i].op = 5;         cin >> tree[i].val;         q.push(i);       }     }     int root;     while (!q.empty()) {       int id = q.front();       root = id;       q.pop();       for (int i = 0; i < tree[id].v.size(); i++) {         degree[tree[id].v[i]]--;         if (!degree[tree[id].v[i]]) q.push(tree[id].v[i]);       }       if (tree[id].op == 5)         continue;       else if (tree[id].op == 1) {         tree[id].val = (tree[tree[id].son1].val && tree[tree[id].son2].val);       } else if (tree[id].op == 2) {         tree[id].val = (tree[tree[id].son1].val || tree[tree[id].son2].val);       } else if (tree[id].op == 3) {         tree[id].val = (tree[tree[id].son1].val ^ tree[tree[id].son2].val);       } else if (tree[id].op == 4) {         tree[id].val = !tree[tree[id].son1].val;       }     }     dfs(root);     for (int i = 1; i <= n; i++)       if (tree[i].op == 5) {         if (tree[i].rev)           cout << !tree[root].val;         else           cout << tree[root].val;       }     return 0;   }   