func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = (int)1e9 + 7;   const int INF = (int)1e9;   const long long LINF = (long long)1e18;   const long double PI = acos((long double)-1);   const long double EPS = 1e-9;   inline long long gcd(long long a, long long b) {     long long r;     while (b) {       r = a % b;       a = b;       b = r;     }     return a;   }   inline long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }   inline long long fpow(long long n, long long k, int p = MOD) {     long long r = 1;     for (; k; k >>= 1) {       if (k & 1) r = r * n % p;       n = n * n % p;     }     return r;   }   template <class T>   inline int chkmin(T& a, const T& val) {     return val < a ? a = val, 1 : 0;   }   template <class T>   inline int chkmax(T& a, const T& val) {     return a < val ? a = val, 1 : 0;   }   template <class T>   inline T isqrt(T k) {     T r = sqrt(k) + 1;     while (r * r > k) r--;     return r;   }   template <class T>   inline T icbrt(T k) {     T r = cbrt(k) + 1;     while (r * r * r > k) r--;     return r;   }   inline void addmod(int& a, int val, int p = MOD) {     if ((a = (a + val)) >= p) a -= p;   }   inline void submod(int& a, int val, int p = MOD) {     if ((a = (a - val)) < 0) a += p;   }   inline int mult(int a, int b, int p = MOD) { return (long long)a * b % p; }   inline int inv(int a, int p = MOD) { return fpow(a, p - 2, p); }   const int maxn = 2000 + 10;   const int maxm = 500000 + 10;   int n, m;   int a[maxm];   int b[maxm];   bitset<maxn << 1> mat[maxn];   void solve() {     cin >> n >> m;     for (int i = (0); i < (m); i++) {       cin >> a[i] >> b[i], a[i]--, b[i]--;       mat[b[i]][a[i]] = 1;     }     for (int i = (0); i < (n); i++)       for (int j = (0); j < (n); j++) mat[i][j + n] = i == j;     for (int i = (0); i < (n); i++) {       if (!mat[i][i]) {         for (int j = (i + 1); j < (n); j++)           if (mat[j][i]) {             mat[i] ^= mat[j];             break;           }       }       for (int j = (0); j < (n); j++) {         if (j == i) continue;         if (mat[j][i]) {           mat[j] ^= mat[i];         }       }     }     for (int i = (0); i < (m); i++) {       if (!mat[a[i]][b[i] + n]) {         cout <<  YES n ;       } else {         cout <<  NO n ;       }     }   }   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     solve();     return 0;   }   