func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long MOD = 1e9 + 7;   const long double E = 1e-9;   char ccc;   bool _minus = false;   inline void read(int &n) {     n = 0;     _minus = false;     while (true) {       ccc = getchar();       if (ccc ==     || ccc ==   n ) break;       if (ccc ==  - ) {         _minus = true;         continue;       }       n = n * 10 + ccc -  0 ;     }     if (_minus) n *= -1;   }   char wwww[12];   int kkkk;   inline void write(int x) {     kkkk = 0;     if (!x) ++kkkk, wwww[kkkk] =  0 ;     while (x) {       ++kkkk;       wwww[kkkk] = char(x % 10 +  0 );       x /= 10;     }     for (int i = kkkk; i >= 1; --i) putchar(wwww[i]);     putchar(   );   }   template <typename T>   inline T sqr(T t) {     return t * t;   }   const int MAX = 1e5;   vector<int> v1[MAX], v2[MAX];   bool ok1[MAX], ok2[MAX];   int ar[MAX];   void dfs1(int pos) {     ok1[pos] = true;     for (int i = 0; i < (int)v1[pos].size(); i++) {       if (!ok1[v1[pos][i]]) {         dfs1(v1[pos][i]);       }     }   }   void dfs2(int pos) {     ok2[pos] = true;     if (ar[pos] == 1) return;     for (int i = 0; i < (int)v2[pos].size(); i++) {       if (!ok2[v2[pos][i]]) {         dfs2(v2[pos][i]);       }     }   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     srand(time(NULL));     cout.precision(15);     cout << fixed;     int n, m;     cin >> n >> m;     for (int i = 0; i < n; i++) cin >> ar[i];     while (m--) {       int a, b;       cin >> a >> b;       a--, b--;       v1[a].push_back(b);       v2[b].push_back(a);     }     for (int i = 0; i < n; i++) {       if (ar[i] == 1 && !ok1[i]) {         dfs1(i);       } else if (ar[i] == 2 && !ok2[i]) {         dfs2(i);       }     }     for (int i = 0; i < n; i++) cout << (ok1[i] && ok2[i] ? 1 : 0) <<   n ;   }   