Submission #755320

#	Time	Username	Problem	Language	Result	Execution time	Memory
755320		pera	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	327 ms	20820 KiB

bobek

#include<bits/stdc++.h>
using namespace std;
 
#define int ll
#define ll long long
 
main(){
	int n , s;cin >> n >> s;
	vector<int> a , b;
	for(int i = 0;i < n;i ++){
	    int x;cin >> x;
	    if(i < n / 2) a.push_back(x);
	    else b.push_back(x);
	}
	vector<int> suma;
	for(int x = 0;x < (1LL << a.size());x ++){
	    int c = 0;
	    for(int i = 0;i < a.size();i ++){
	        if((1LL << i) & x) c += a[i]; 
	    }
	    suma.push_back(c);
	}
	sort(suma.begin() , suma.end());
	vector<int> sums;
	for(int x = 0;x < (1LL << b.size());x ++){
	    int c = 0;
	    for(int i = 0;i < b.size();i ++){
	        if((1LL << i) & x) c += b[i];
	    }
	    sums.push_back(c);
	}
	int ans = 0;
	sort(sums.begin() , sums.end());
	int y = sums.size() - 1 , p = sums.size() , oc = 0;
    for(int i = 0;i < suma.size();i ++){
        oc = 1;
        while(i + 1 < suma.size() && suma[i + 1] == suma[i]) ++ i , ++ oc;
        while(s - suma[i] < sums[y] && y >= 0) -- y , -- p;
        if(s - suma[i] >= sums[y]) ans += oc * p;
    }
	cout << ans << endl;
}

Compilation message (stderr)

bobek.cpp:7:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    7 | main(){
      | ^~~~
bobek.cpp: In function 'int main()':
bobek.cpp:18:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |      for(int i = 0;i < a.size();i ++){
      |                    ~~^~~~~~~~~~
bobek.cpp:27:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |      for(int i = 0;i < b.size();i ++){
      |                    ~~^~~~~~~~~~
bobek.cpp:35:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     for(int i = 0;i < suma.size();i ++){
      |                   ~~^~~~~~~~~~~~~
bobek.cpp:37:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         while(i + 1 < suma.size() && suma[i + 1] == suma[i]) ++ i , ++ oc;
      |               ~~~~~~^~~~~~~~~~~~~

• 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