Submission #72411

#	Time	Username	Problem	Language	Result	Execution time	Memory
72411		someone_aa	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	571 ms	21500 KiB

bobek

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
using namespace std;
const int maxn = 42;
vector<ll>suma, sumb;
ll arr[maxn], n, fn, sn;
ll budget;

void get_f() {
    for(int i=0;i<(1<<fn);i++) {
        ll sum = 0LL;
        for(int j=0;j<fn;j++) {
            if(i&(1<<j)) {
                sum += arr[j];
            }
        }
        suma.pb(sum);
    }
    sort(suma.begin(), suma.end());
}

void get_s() {
    for(int i=0;i<(1<<sn);i++) {
        ll sum = 0LL;
        for(int j=0;j<sn;j++) {
            if(i&(1<<j)) {
                sum += arr[j+fn];
            }
        }
        sumb.pb(sum);
    }
    sort(sumb.begin(), sumb.end());
}

void solve() {
    ll result = 0LL;
    for(int i=0;i<suma.size();i++) {
        if(suma[i] > budget) continue;
        else {
            int ind = 0;
            for(int cekor = sumb.size()/2;cekor>0;cekor/=2) {
                while(ind + cekor < sumb.size() && sumb[ind+cekor]<=(budget-suma[i])) ind += cekor;
            }
            result += 1LL * (ind+1);
        }
    }
    cout<<result;
}

int main() {

    cin>>n>>budget;
    for(int i=0;i<n;i++) {
        cin>>arr[i];
    }
    fn = n / 2;
    sn = n - fn;
    get_f();
    get_s();
    solve();
    return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'void solve()':
bobek.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<suma.size();i++) {
                 ~^~~~~~~~~~~~
bobek.cpp:44:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 while(ind + cekor < sumb.size() && sumb[ind+cekor]<=(budget-suma[i])) ind += cekor;
                       ~~~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10