Submission #977077

#TimeUsernameProblemLanguageResultExecution timeMemory
977077vjudge1Ice Hockey World Championship (CEOI15_bobek)C++14
100 / 100
370 ms21688 KiB
#include<bits/stdc++.h> #define ll long long using namespace std; const int mxN = 40 + 5; int n; ll m; ll a[mxN]; vector<ll> comb_l , comb_r; void make_combination(){ int mid = n/2; // comb_l [1 , mid] int lim = 1<<mid; for(int mask=0;mask<lim;mask++){ ll sum = 0; for(int i=0;i<mid;i++){ if((1<<i) & mask) sum += a[i]; if(sum > m) break; } if(sum <= m) comb_l.push_back(sum); } sort(comb_l.begin() , comb_l.end()); // comb_r lim = 1<<(n-mid); for(int mask=0;mask<lim;mask++){ ll sum = 0; for(int i=0;i<(n-mid);i++){ if((1<<i) & mask) sum += a[i+mid]; if(sum>m) break; } if(sum <= m) comb_r.push_back(sum); } sort(comb_r.begin() , comb_r.end()); } int main(){ ios::sync_with_stdio(0),cin.tie(0); cin>> n >> m; for(int i=0;i<n;i++) cin>> a[i]; make_combination(); // for(auto val : comb_l) cout<< val << " "; // cout<< "\n"; // for(auto val : comb_r) cout<< val << " "; // cout<< "\n"; ll ans = 0; for(ll val : comb_r){ int cnt = upper_bound(comb_l.begin() , comb_l.end() , m - val) - comb_l.begin(); // cout<< cnt << " "; ans += cnt; } // cout<< "\n"; cout<< ans; return 0; }
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