Submission #393877

#	Time	Username	Problem	Language	Result	Execution time	Memory
393877		Pietra	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	571 ms	20832 KiB

bobek

#include<bits/stdc++.h>
using namespace std ; 
#define int long long 
 
const int maxn = 40 ; 
 
int x, n, v[maxn], ans ; 
vector<int> m1, m2 ; 
 
int32_t main(){
 
	cin >> n >> x ; 
 
	for(int i = 0 ; i < n ; i++) cin >> v[i] ; 
 
	int esq = (n+1)>>1 ; 
    int dir = (n>>1) ; 
 
	for(int mask = 0 ; mask < (1<<dir) ; mask++){
		int s = 0 ; 
		for(int i = 0 ; i < dir ; i++){
			if(mask&(1<<i)) s += v[i] ; 
		}
		m1.push_back(s) ; 
	}
 
	for(int mask = 0 ; mask < (1<<esq) ; mask++){
		int s = 0 ;
		for(int i = 0 ; i < esq ; i++){
			if(mask&(1<<i)) s += v[i+dir] ; 
		} 
		m2.push_back(s) ; 
	}
 
	sort(m2.begin(), m2.end()) ; 
 
	for(int i = 0 ; i < m1.size() ; i++){
		int u = upper_bound(m2.begin(), m2.end(), x - m1[i]) - m2.begin() ; 
		ans += u ; 
	}
 
	cout << ans << "\n" ; 
 
} 

Compilation message (stderr)

bobek.cpp: In function 'int32_t main()':
bobek.cpp:37:20: 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 |  for(int i = 0 ; i < m1.size() ; i++){
      |                  ~~^~~~~~~~~~~

• 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