// Problem: Elevator Rides // #pragma GCC optimize("O3") // #pragma GCC target("avx2") #include <bits/stdc++.h> using namespace std ; #define ff first #define ss second #define pb push_back #define lb lower_bound #define ub upper_bound #define sz(x) (int)x.size() #define all(x) x.begin(), x.end() #define ones(x) __builtin_popcount(x) #define remove(v) v.erase(unique(all(v)), v.end()) #define rep(i, a, b) for(int i = a; i <= b; i++) #define per(i, a, b) for(int i = a; i >= b; i--) #ifdef local #include "C:\debug.h" #else #define dbg(x...) 42 #endif #define int long long const int N = 2e6 + 2 ; const int MOD = 1e9 + 7 ; const int P = 1007 ; int n , m , a[21] , b[21] , p[21] ; int dp[1048577] ; void solve(){ p[0] = 1 ; rep(i , 1 , 20) p[i] = p[i - 1] * P , p[i] %= MOD ; cin >> n >> m ; int hash = 0 ; rep(i , 1 , n) cin >> a[i] ; sort(a + 1 , a + 1 + n) ; rep(i , 1 , n) { int cur = (a[i] * (p[i] % MOD)) % MOD ; hash += cur ; hash %= MOD ; } set<int> w(a + 1 , a + 1 + n) ; rep(i , 1 , m) cin >> b[i] ; set<pair<int,int>> e ; rep(i , 1 , (1 << m) - 1) { int cur = 0 ; rep(mask , 0 , m - 1) { if((i >> mask) & 1) { cur += b[mask + 1] ; } } if(cur <= 1000 && w.count(cur)) e.insert({i , cur}) ; } vector<pair<int,int>> item(all(e)) ; int sz = sz(item) ; rep(i , 0 , (1 << sz) - 1) { vector<int> v ; int cur = 0 ; bool ok = 1 ; rep(mask , 0 , sz - 1) { if((i >> mask & 1)) { int x = ones(cur) ; int y = ones(item[mask].first) ; cur ^= item[mask].first ; if(x + y != ones(cur)) { ok = 0 ; break ; } v.pb(item[mask].second) ; } } sort(all(v)) ; int H = 0 , id = 0 ; for(auto& x : v) { id++ ; int add = (x * (p[id] % MOD)) % MOD ; H += add ; H %= MOD ; } if(H == hash) { cout << "YES\n" ; return ; } } cout << "NO\n" ; } signed main () { // ios::sync_with_stdio(false) ; // cin.tie(0) ; int test = 1 ; // cin >> test ; for(int i = 1 ; i <= test ; i++) { solve() ; } }

bank.cpp: In function 'void solve()':
bank.cpp:63:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
   63 |         bool ok = 1 ;
      |              ^~