Submission #1124806

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124806		luvna	Ice Hockey World Championship (CEOI15_bobek)	C++20	100 / 100	262 ms	20900 KiB

bobek

#include<bits/stdc++.h>

#define MASK(i) (1 << (i))
#define pub push_back
#define all(v) v.begin(), v.end()
#define compact(v) v.erase(unique(all(v)), end(v))
#define pii pair<int,int>
#define fi first
#define se second
#define endl "\n"
#define sz(v) (int)(v).size()
#define dbg(x) "[" #x " = " << (x) << "]"

using namespace std;

template<class T> bool minimize(T& a, T b){if(a > b) return a = b, true;return false;}
template<class T> bool maximize(T& a, T b){if(a < b) return a = b, true;return false;}

typedef long long ll;
typedef long double ld;

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand(ll l, ll r){return uniform_int_distribution<ll>(l, r)(rng);}

void solve(){
    int n; ll limit; cin >> n >> limit;

    vector<ll> a, b;

    for(int i = 1; i <= n / 2; i++){
        ll x; cin >> x;
        a.pub(x);
    }

    for(int i = 1; i <= n - sz(a); i++){
        ll x; cin >> x;
        b.pub(x);
    }

    vector<ll> cntA, cntB;

    for(int mask = 1; mask < (1 << sz(a)); mask++){
        ll sum = 0;
        for(int i = 0; i < sz(a); i++){
            if(mask >> i & 1) sum += a[i];
        }
        if(sum > limit) continue;
        cntA.pub(sum);
    }

    for(int mask = 1; mask < (1 << sz(b)); mask++){
        ll sum = 0;
        for(int i = 0; i < sz(b); i++){
            if(mask >> i & 1) sum += b[i];
        }
        if(sum > limit) continue;
        cntB.pub(sum);
    }

    ll ans = sz(cntA) + sz(cntB) + 1;

    sort(all(cntA), greater<ll>());
    sort(all(cntB));

    for(int i = 0, j = 0; i < sz(cntA); i++){
        while(j < sz(cntB) && cntA[i] + cntB[j] <= limit) j++;
        ans += j;
    }

    cout << ans;
}

signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);

    #define task "task"

    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    int t; t = 1; //cin >> t;
    while(t--) solve();
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bobek.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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