func_code_string: #include <bits/stdc++.h>   using namespace std;   const int SIZE = 100005;   const int MSIZE = 10000;   const int INF = 1 << 30;   set<int>::iterator it;   int main() {     int n, a, b;     int p[SIZE];     set<int> fi, se;     map<int, int> mp;     bool flag[SIZE];     while (cin >> n >> a >> b) {       fi.clear(), se.clear(), mp.clear();       memset(flag, 0, sizeof(flag));       for (int i = 0; i < n; i++) {         scanf( %d , &p[i]);         fi.insert(p[i]);         mp[p[i]] = i;       }       vector<int> v;       for (it = fi.begin(); it != fi.end(); it++) {         if (fi.find(a - *it) == fi.end()) {           se.insert(*it);           v.push_back(*it);         }       }       for (int i = 0; i < v.size(); i++) {         fi.erase(v[i]);         se.insert(v[i]);       }       bool mark = 0;       while (!se.empty()) {         it = se.begin();         int x = *it;         if (se.find(b - x) != se.end()) {           flag[mp[x]] = flag[mp[b - x]] = 1;           se.erase(x);           if ((x)*2 != b) se.erase(b - x);         } else if (fi.find(b - x) != fi.end()) {           flag[mp[x]] = flag[mp[b - x]] = 1;           fi.erase(b - x);           se.erase(x);           if ((b - x) * 2 != a) {             fi.erase(a - (b - x));             se.insert(a - (b - x));           }         } else {           puts( NO );           mark = 1;           break;         }       }       if (mark) continue;       puts( YES );       for (int i = 0; i < n; i++) printf( %d  , flag[i]);       puts(  );     }   }   