Submission #1082763

#TimeUsernameProblemLanguageResultExecution timeMemory
1082763steveonalexIce Hockey World Championship (CEOI15_bobek)C++17
40 / 100
367 ms8564 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; #define MASK(i) (1LL << (i)) #define GETBIT(mask, i) (((mask) >> (i)) & 1) #define ALL(v) (v).begin(), (v).end() #define block_of_code if(true) ll max(ll a, ll b){return (a > b) ? a : b;} ll min(ll a, ll b){return (a < b) ? a : b;} ll gcd(ll a, ll b){return __gcd(a, b);} ll lcm(ll a, ll b){return a / gcd(a, b) * b;} ll LASTBIT(ll mask){return (mask) & (-mask);} int pop_cnt(ll mask){return __builtin_popcountll(mask);} int ctz(ull mask){return __builtin_ctzll(mask);} int logOf(ull mask){return 63 - __builtin_clzll(mask);} mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count()); ll rngesus(ll l, ll r){return l + (ull) rng() % (r - l + 1);} double rngesus_d(double l, double r){ double cur = rngesus(0, MASK(60) - 1); cur /= MASK(60) - 1; return l + cur * (r - l); } template <class T1, class T2> bool maximize(T1 &a, T2 b){ if (a < b) {a = b; return true;} return false; } template <class T1, class T2> bool minimize(T1 &a, T2 b){ if (a > b) {a = b; return true;} return false; } template <class T> void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){ for(auto item: container) out << item << separator; out << finish; } template <class T> void remove_dup(vector<T> &a){ sort(ALL(a)); a.resize(unique(ALL(a)) - a.begin()); } int main(void){ ios::sync_with_stdio(0);cin.tie(0); cout.tie(0); clock_t start = clock(); int n; ll w; cin >> n >> w; vector<ll> a(n); for(int i = 0; i<n; ++i) cin >> a[i]; vector<ll> sum = {0}; if (n > 20){ for(int mask = 1; mask < MASK(n - 20); ++mask){ ll cur = 0; for(int i = 0; i<n - 20; ++i) if (GETBIT(mask, i)) cur += a[i]; sum.push_back(cur); } } sort(ALL(sum)); ll ans = 0; for(int mask = 0; mask < MASK(min(n, 20)); ++mask){ ll cur = 0; for(int i = 0; i < min(n, 20); ++i) if (GETBIT(mask, i)) cur += a[i]; ans += upper_bound(ALL(sum), w - cur) - sum.begin(); } cout << ans << "\n"; cerr << "Time elapsed: " << clock() - start << " ms\n"; return 0; }
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