Submission #120612

#	Time	Username	Problem	Language	Result	Execution time	Memory
120612		Mercenary	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	343 ms	16848 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;
//    n = 40;can = 1e18;
    for(int i = 0 ; i < n / 2 ; ++i){
        cin >> a[i];
//        a[i] = 1;
    }
    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];
            if(sum > can)break;
        }
        if(sum <= can)val.pb(sum);
    }
    n -= (n / 2);
    for(int i = 0 ; i < n ; ++i){
        cin >> a[i];
//        a[i] = 1;
    }
    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];
            if(sum > can)break;
        }
        if(sum <= can)val1.pb(sum);
    }
    sort(val.begin(),val.end());
    sort(val1.begin(),val1.end());
    int j = val.size() - 1;
    ll res = 0;
    for(ll c : val1){
        while(j >= 0 && val[j] > can - c)--j;
        res += j + 1;
//        cout << " " << c << " " << j << endl;
    }
//    cout << val1.size() << " " <<  val.size() << 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:69:10: 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:70:10: 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: 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