Submission #120596

#	Time	Username	Problem	Language	Result	Execution time	Memory
120596		Mercenary	Ice Hockey World Championship (CEOI15_bobek)	C++14	20 / 100	329 ms	16784 KiB

bobek

#include<bits/stdc++.h>

using namespace std;
#define taskname "A"
#define pb	push_back
#define mp 	make_pair
#ifndef LOCAL
#define cerr if(0)cout
#endif

typedef long double ld;
typedef long long ll;
typedef pair<int,int> ii;
typedef pair<ll,int> lli;
const int maxn = 1e6 + 6;
const ld inf = 1e9 + 5;

int n;
ll a[maxn];
ll can;
vector<ll> val , val1;
void enter(){
    cin >> n >> can;
    for(int i = 0 ; i < n / 2 ; ++i){
        cin >> a[i];
    }
    val.reserve((1 << (n / 2)));
    for(int j = 0 ; j < (1 << (n / 2)) ; ++j){
        ll sum = 0;
        for(int i = 0 ; i < n / 2 ; ++i){
            if((j >> i) & 1)sum += a[i];
        }
        val.pb(sum);
    }
    sort(val.begin(),val.end());
    n -= (n / 2);
    for(int i = 0 ; i < n ; ++i){
        cin >> a[i];
    }
    val1.reserve((1 << n));
    for(int j = 0 ; j < (1 << n) ; ++j){
        ll sum = 0;
        for(int i = 0 ; i < n ; ++i){
            if((j >> i) & 1)sum += a[i];
        }
        val1.pb(sum);
    }
    sort(val1.begin(),val1.end());
    int j = val.size() - 1;
    int res = 0;
    for(int c : val1){
        while(j >= 0 && val[j] > can - c)--j;
        res += j + 1;
//        cout << j << endl;
    }
    cout << res;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    enter();
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:64:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
bobek.cpp:65:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10